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Monthly Global Tropical Cyclone Summary August 2000
[Summaries and Track Data] [Prepared by Gary Padgett]


                              AUGUST, 2000

  (For general comments about the nature of these summaries, as well as
  information on how to download the tabular cyclone track files, see
  the Author's Note at the end of this summary.)



     I would like up front to extend a very special thanks to two young
  gentlemen who helped me in a very big way with portions of the August
  summary.   John Wallace, a student at the University of Texas in San
  Antonio, wrote the narratives for Northeast Pacific cyclones Fabio,
  Gilma, Hector, and Ileana.  Eric Blake, a graduate student at Colorado
  State University and a member of the CSU seasonal forecasting team,
  wrote the summary for Hurricane Alberto while working a two-month
  stint at TPC/NHC.  
                           AUGUST HIGHLIGHTS

  --> Northeast and Northwest Pacific basins very active
  --> Destructive super typhoon strikes Taiwan and Chinese mainland
  --> Central North Pacific area remains active
  --> Long-lived Atlantic hurricane sets several records


                 ***** Topic of the Month for August *****


     The following table is based on information compiled by John Wallace
  of San Antonio, Texas.   John prepared a monthly table for all cyclones
  reaching tropical storm intensity (NS), one for all storms reaching
  hurricane intensity (H), and one for intense hurricanes (IH), i.e.,
  those hurricanes which reached Category 3 or higher on the Saffir/
  Simpson Scale.      I combined the NS and H tables into one in the
  interest of saving space, and just included the monthly totals and
  averages for the IHs.   The only month in which four IHs formed was
  August, 1972, while several months produced three intense hurricanes.

     The first number in each column is the number of NS which initially
  reached tropical storm intensity (1-min avg MSW of 34 kts) during the
  month.  The number in parentheses is the number of tropical cyclones
  which initially reached hurricane intensity (1-min avg MSW of 64 kts)
  during the month.   John's counting procedure is apparently the same
  as I now personally prefer also (although I haven't always).  Taking
  September and October, 1972, as an example:  the only NS forming in
  October, Tropical Storm Kathleen, did not reach hurricane intensity.
  But Tropical Storm Joanne, which formed in September, reached hurricane
  intensity in October.   Hence, Joanne is counted as a September NS but
  as a hurricane for October.   Similarly, the only storm initially
  reaching tropical storm intensity in October, 1973, was Hurricane
  Lillian.   But Tropical Storm Katherine, which formed in September,
  reached hurricane intensity in October; therefore, October is shown
  as having one NS but two hurricanes.

                      TROPICAL STORMS and HURRICANES
               for the EASTERN NORTH PACIFIC (East of 140W)
                               1971 - 1999

        May     Jun     Jul     Aug     Sep     Oct     Nov     Total

1971     1 (1)   1 (1)   6 (4)   5 (3)   2 (2)   2 (1)   1      18 (12)
1972             1 (1)   1       6 (6)   2       1 (1)   1      12 ( 8)
1973             3 (1)   4 (3)   1       3 (1)   1 (2)          12 ( 7)
1974     1       3 (2)   3 (2)   6 (4)   2 (2)   2 (1)          17 (11)
1975             2 (1)   4 (2)   5 (3)   3 (1)   1 (1)   1      16 ( 8)
1976             2 (2)   4 (1)   3 (2)   4 (2)   1 (1)          14 ( 8)
1977     1       1       1 (1)   1 (1)   3 (1)   1 (1)           8 ( 4)
1978     1 (1)   3 (2)   4 (3)   6 (4)   2 (2)   2 (1)          18 (13)
1979             2 (1)   2 (1)   2 (2)   1 (1)   2 (1)   1      10 ( 6)
1980             3 (2)   5 (1)   2 (3)   2 (1)   2              14 ( 7)
1981     1       1 (1)   3 (1)   4 (3)   2 (1)   4 (2)          15 ( 8)
1982     1       1       6 (4)   5 (3)   3 (3)   3 (1)          19 (11)
1983     1 (1)   1 (1)   6 (2)   3 (1)   4 (3)   4 (3)   1      21 (12)**
1984     2 (1)   3 (3)   3 (2)   4 (2)   4 (4)   1       1      18 (12)
1985             5 (2)   7 (2)   4 (2)   4 (4)   2 (2)          22 (12)
1986     1 (1)   2 (1)   3 (2)   5 (1)   5 (2)   1 (2)          17 ( 9)
1987             1       6 (2)   5 (3)   3 (3)   3 (1)          18 ( 9)
1988             2       6 (2)   3 (3)   1 (1)   1              13 ( 6)
1989             3 (2)   4 (2)   6 (2)   4 (3)                  17 ( 9)
1990     1 (1)   4 (2)   4 (4)   3 (3)   5 (4)   3 (2)          20 (16)
1991     1       3 (2)   2 (2)   2 (1)   3 (2)   2 (2)   1 (1)  14 (10)
1992             3 (1)   6 (4)   5 (2)   5 (5)   5 (2)          24 (14)
1993             2 (1)   3 (3)   5 (4)   3 (2)   1              14 (10)
1994             3 (1)   4 (2)   4 (3)   5 (2)   1 (1)          17 ( 9)
1995             1 (1)   3 (2)   3 (1)   3 (3)                  10 ( 7)
1996     1       2 (2)   2 (1)           4 (1)     (1)           9 ( 5)
1997             3       4 (3)   3 (2)   5 (2)   1 (1)   1 (1)  17 ( 9)
1998             2 (1)   3 (2)   3 (2)   2 (1)   3 (3)          13 ( 9)
1999             1 (1)   2 (1)   3 (2)   2 (2)   1               9 ( 6)

Total NS: 13     64     111     107      91      51       8     445
Avg NS: 0.45    2.21    3.83    3.69    3.14    1.76    0.28    15.35
Total H:   6     35      61      68      61      33       2     266
Avg H:  0.21    1.21    2.10    2.35    2.10    1.14    0.07     9.17
Total IH:  0     13      34      32      33      19       0     131
Avg IH:    0    0.45    1.17    1.10    1.14    0.66      0      4.51

** - Hurricane Winnie, which formed in December, is counted in the
     seasonal total for NS and H.

     During the average Eastern North Pacific season, approximately
  56% of all tropical storms reach hurricane intensity while 31% of
  all storms eventually become intense hurricanes.  Also, about 56%
  of all hurricanes reach intense hurricane status.

     The year 1966 is most often quoted as the year in which Eastern
  North Pacific tropical cyclone records became reliable due to the
  availability of complete operational satellite coverage beginning that
  year.   However, the Best Track file for the NEP basin does not show a
  single intense hurricane for the years 1966-1970, whereas in 1971 there
  were six.     That season, as well as the following two, saw fairly
  extensive aerial reconnaissance of Eastern North Pacific cyclones, so,
  even though the initial Dvorak method had not been developed in the
  early 1970s, the reconnaissance data, in conjunction with some earlier
  methods of assessing storm intensity from satellite imagery, give the
  Best Track MSW values a reasonable degree of reliability beginning
  with 1971.

     The maximum number of intense hurricanes seen to develop in Eastern
  Pacific waters is eight, and that has occurred four times:  1983, 1985,
  1992 and 1993.     In 1997 seven hurricanes reached Category 3-plus
  status, including Hurricane Linda, which was the most intense tropical
  cyclone observed in the NEP basin since the advent of satellites.
  Several years have seen six intense hurricanes develop while the only
  year with no major storm was 1977, and only one was observed in 1981.

                           ACTIVITY BY BASINS

  ATLANTIC (ATL) - North Atlantic Ocean, Caribbean Sea, Gulf of Mexico

  Activity for August:  1 tropical depression
                        1 possible tropical depression or storm **
                        1 subtropical storm
                        2 tropical storms
                        2 hurricanes

  ** - no warnings were issued on this system by TPC/NHC

  NOTE:  Much of the information presented below was obtained from the
  TPC/NHC discussion bulletins issued with every regular advisory.  All
  references to sustained winds imply a 1-min averaging period unless
  otherwise noted.    And, as noted above, the summary for Hurricane
  Alberto was written by Eric Blake.

                   Atlantic Tropical Activity for August

     Following two tropical depressions in the month of June, the
  Atlantic basin was very quiet through the month of July as unfavorable
  upper-level westerlies spread over much of the basin at lower
  latitudes.  However, the situation changed very quickly in August as
  the long-lived Hurricane Alberto formed early in the month and lasted
  almost three weeks.   Alberto became the first hurricane and the first
  major hurricane (Category 3 on the Saffir/Simpson scale) of the season
  as winds climbed to 110 kts.  Three more storms were named during the
  month, but only one--Debby--reached minimal hurricane intensity.  In
  addition, advisories were issued on a tropical depression (TD-04) off
  the east coast of Florida.

     Another system attended by deep convection moved northeastward off
  the mid-Atlantic coast on 10-13 Aug.  A reconnaissance aircraft flew
  into the system on the afternoon of the 10th but found no closed
  low-level circulation.   But as the LOW moved northeastward on 11 Aug
  it did appear to have a circulation.   SAB assigned T-numbers of 2.0
  during the morning of 12 Aug and a ship reported 35-kt winds around
  1200 UTC.  For these reasons I am including a report on this system,
  which I have dubbed "Lambda", in this summary.

     Finally, a LOW with some distinctive subtropical characteristics
  developed in the western Atlantic just off the southeast U. S. coast
  in late August and moved inland along the North Carolina coast on
  the 30th.   David Roth of HPC has supplied me with a track for this
  system, and it appears to have briefly reached subtropical storm
  intensity on 30 Aug when there were some ship reports of winds to
  35 kts.   The initial weak LOW formed on 28 Aug just east of West
  Palm Beach and drifted northward for about 24 hours, then moved
  somewhat to the northeast to a point about 200 nm south of Cape
  Hatteras by 30/0600 UTC.   The system then turned back to the west-
  northwest toward the Carolina coast.  At 1200 UTC it was centered
  approximately 125 nm southwest of Cape Hatteras, and it was at this
  time that David's track assigns a MSW of 35 kts.

     The LOW began to weaken slightly as it approached the coast, and
  the maximum winds were estimated at 30 kts as it made landfall near
  Carolina Beach (just north of Cape Fear) around 1800 UTC.  The system
  continued moving toward the west across southeastern North Carolina
  and South Carolina, eventually reaching north-central Georgia by 1800
  UTC on the 31st.   David's notes indicate that the strongest winds 
  were found in the northeastern quadrant except just prior to landfall
  when some higher winds were noted on the western side.  The LOW was
  slowly acquiring tropical characteristics as temperatures at 500 mb
  rose from -12 C to -6 C in less than two days near the center, and the
  core was neutral to slightly warm when it made landfall.  (A special
  thanks to David for the information he provided.)

                       Hurricane Alberto  (TC-03)
                             4 - 23 August

     Alberto broke a number of records for the Atlantic basin as it
  slowly moved across the Atlantic for about 20 days.  Alberto was the
  longest-lived tropical storm on record in August in the Atlantic basin,
  maintaining tropical storm status for 19.25 days.    It was also the
  third longest-lived tropical storm on record, behind Ginger of 1971
  (21.25 days) and Carrie of 1957 (19.50 days).  The storm completed the
  largest loop ever noted over the Atlantic, spanning approximately 5
  degrees latitude by 8 degrees longitude.  Alberto also became a major
  hurricane unusually far to the north--about 35N.  It is also remarkable
  how low the shear was during most of the life of the storm, with the
  storm coming close to its Maximum Potential Intensity estimate.
  Alberto actually increased in strength a couple of times while the
  water temperatures were decreasing under its path, illustrating the
  dominance of vertical shear on the intensification process of tropical

     The first sign of Alberto can be traced to an extremely large MCS
  with cloud temperatures below -88 C that fired over central Africa on
  30 Jul.   This system tracked to the west and was very convectively
  active, coming off the African coast with large pressure falls and a
  50-kt jet at 700 mb over Dakar.  This site in Senegal received about
  25 mm of precipitation as the wave moved through, which is a rather
  heavy amount for this location.    The system moved off the coast on
  3 Aug and an unknown ship reported southeast winds of 37 kts just off
  the African coast.    Ship MZYF3 reported 45 kts and a pressure of
  1007.8 mb at 0600 UTC on the 4th and Alberto was born.    It is
  probable that this system was already a tropical storm as it emerged
  from the coast, judging from the excellent satellite appearance and
  the ship reports.

     Alberto moved to the west-northwest and continued to intensify under
  a favorable outflow pattern.  A banding-type eye was noted late on the
  4th and a CDO feature was observed on the 5th, with the appearance of
  an eye later that afternoon.   Alberto was upgraded to a hurricane
  about 425 nm west of the Cape Verde Islands at 05/1800 UTC.   However,
  its intensification was limited as it began to move over cool waters
  of about 25-26 degrees C.  The storm reached an initial peak intensity
  of about 80 kts on the 7th before southwesterly wind shear began to
  take its toll.    Alberto maintained minimal hurricane status until
  1800 UTC on the 8th when it took a turn to the northwest into even
  cooler waters and weakened into a tropical storm.   A weak mid-level
  ridge over the Central Atlantic persisted, preventing any recurvature
  of the system.

     Two days later Alberto moved over anomalously warm water in the
  Mid-Atlantic.  This effect, combined with weaker vertical wind shear,
  helped to re-strengthen the storm into a hurricane by 1800 UTC on the
  9th.   Alberto's track began to curve more to the north and it slowly
  intensified.   The storm passed about 215 nm east of Bermuda around
  1200 UTC on 11 Aug.    Unlike most hurricanes, Alberto reached its
  maximum intensity after recurvature, becoming a major hurricane on the
  morning of the 12th north of 35N.  A large, 45 nm-wide eye was noted on
  visible satellite images and, based upon T-numbers of 6.0 from TAFB and
  5.5 from SAB, the MSW was increased to its peak intensity of 110 kts
  later that day, notably very close to its estimated Maximum Potential
  Intensity (MPI) as calculated by the Demaria/Kaplan scheme.    The
  hurricane's center was located roughly 535 nm east-northeast of Bermuda
  at the time it reached its estimated peak intensity.     Most model
  guidance took Alberto rapidly northeastward over the North Atlantic,
  merging with an extratropical cyclone and losing tropical
  characteristics, but the storm had other ideas.  The GFDL was the first
  model to indicate that the storm would miss the trough and begin to
  execute a loop.  The track bent from northeast to east and never
  crossed 40N, where extremely high wind shear and cool SSTs would have
  killed the storm.   A large high-pressure system was building in the
  North Atlantic and Alberto was unexpectedly trapped underneath the

     Alberto slowed down and weakened some as it was moving over SSTs of
  about 23 C.  The hurricane diminished and became a sheared tropical
  storm on the 14th.  The track took a hard turn toward the right and
  Alberto began to slowly move southward, averaging a forward speed of
  less than 10 kts.    The cloud pattern at times did not look very
  tropical, with limited deep convection providing some evidence of
  Alberto taking on subtropical characteristics on the 15th.  The storm
  weakened further--to 40 kts--and began to move toward the southwest.
  However, wind shear decreased and SSTs warmed along the path of the
  storm, allowing for the regeneration of considerable convection on the
  16th as Alberto turned toward the west-southwest.  

     The storm began to re-intensify slowly as it proceeded to move to
  the west on the 17th.  Alberto took a sharp turn toward the northwest
  as a large, slow-moving mid-latitude trough was carving out over the
  eastern United States.   A possible eyewall was noted in AMSU images
  late on the 17th and Alberto became a hurricane again for the third
  time on the 18th.  This is notable because I could not find a tropical
  system in the Best Track database that had re-intensified into a
  hurricane three times after having weakened to a tropical storm, and
  Alberto may very well have been the first.

     The hurricane continued to intensify as it moved slowly northward
  since wind shear was near zero.  Even though water temperatures were
  decreasing, Alberto peaked again with an intensity of 95 kts on the
  afternoon of the 19th with a large, 50-nm wide ragged eye.  The
  hurricane continued to move unusually slowly to the north as it
  remained contained under a large ridge.    The high-pressure system
  gradually broke down as the large trough finally began to pick up the
  storm.  Alberto turned to the north-northeast and accelerated while
  traveling over progressively cooler waters, completing its large
  anticyclonic loop on the morning of the 21st.  The hurricane maintained
  an eye-like feature and hurricane status until the evening of the 22nd
  as it was screaming northeastward, far into the North Atlantic 
  (nearing 50N).  Alberto transitioned into an extratropical cyclone just
  south of Iceland, as indicated by satellite pictures.   It is quite
  unusual for a storm to retain tropical characteristics up to 53N as
  Alberto did, the last storm to do so being Hurricane Frances in 1980.
  No reports are available on the impact of Alberto on Iceland, but it is
  estimated that winds in excess of tropical storm force were felt there.
  Some swells were reported along the U. S. East Coast a few days after
  the storm's recurvature.

                       Tropical Depression  (TD-04)
                               4 - 10 August

     A small area of disturbed weather formed on 4 Aug approximately
  525 nm east-southeast of Bermuda.   The attendant weak LOW initially
  drifted southwestward, then westward over the next several days.  By
  6 Aug a few showers and thunderstorms were occurring in association
  with the small LOW.  The system passed about 300 nm south of Bermuda
  around 07/0000 UTC and thereafter took a short jog to the northwest
  before resuming its westward motion.    On the afternoon of the 8th
  the LOW was roughly 275 nm east of Cape Canaveral when it was visited
  by a U. S. Air Force Reserve Hurricane Hunter flight.     The plane,
  flying at 450 m, reported a peak FLW of 37 kts in the north quadrant
  at 1851 UTC, and later reported finding winds to 47 kts in the west
  quadrant at 2003 UTC.  The minimum pressure reported by the flight was
  1010 mb.     However, the system lacked any organized thunderstorm
  activity so TPC/NHC did not at this time classify the system as a
  tropical depression.   During the evening some winds of 20-30 kts were
  reported over a limited area near the center as the system moved to
  the west-southwest at around 8 kts.

     By the morning of 9 Aug some intermittent convection was occurring
  over a limited area near the center, and the first advisory on TD-04
  was issued at 1500 UTC with the system located approximately 175 nm
  east-southeast of Cape Canaveral.   Satellite intensity estimates were
  only 25 kts, but the LLCC appeared to be better defined than the day
  before and the initial intensity was set at 30 kts.  The depression,
  which really seemed to be more subtropical than tropical, was moving
  slowly westward at only 3 kts.   A reconnaissance flight during the
  afternoon found maximum FLW of 39 kts in the northwest quadrant with
  the minimum CP still holding at 1010 mb.   During the evening a buoy
  (WMO 41010), located about 50 nm north of the center, reported winds
  of 20 kts.

     The depression reached the westernmost point in its track around
  10/0600 UTC when it was centered about 70 nm east of Cape Canaveral.
  During the morning Melbourne Doppler radar showed some well-organized
  banding features associated with the small depression, but overall
  the cloud pattern still looked ragged due to easterly shear.  Reports
  from buoy 41010 suggested that the depression had lost the tight wind
  core it had exhibitied over the previous two days.   During the 10th
  the system's motion became generally northeastward, and by evening
  the strong vertical shear had taken its toll and the depression
  appeared weaker.   A reconnaissance aircraft did find 31-kt winds
  southeast of the center at 2146 UTC, but since the system was weakening
  and the shear was still strong,  TPC/NHC issued the final advisory
  at 11/0300 UTC.  The remnants were forecast to move to the northeast
  and continue to generate a few isolated thunderstorms.

     John Wallace passed along some interesting, but somewhat disturbing,
  news to the author.   It seems that some meteorologists, including one
  with a well-known private firm, repeatedly referred to TD-04 as an
  unnamed tropical storm online, likely because of the stronger winds
  found by the reconnaissance aircraft.    Also, the weather page in a
  major newspaper in a certain large eastern U. S. city depicted the
  system as Tropical Storm Beryl spinning around off the Florida coast!

                    Possible Tropical Cyclone "Lambda"
                              10 - 13 August

     The origins of this system are a little uncertain, but appear to
  be associated with the northern end of a tropical wave which left the
  west coast of Africa around 2 Aug.     The wave propagated westward
  across the Atlantic as tropical waves normally do, and by 1800 UTC on
  7 Aug was located in the vicinity of 65W where a 1012-mb LOW had formed
  on the wave axis about 150 nm north-northwest of San Juan, Puerto Rico.
  By the 8th the wave was producing showers and thunderstorms over waters
  north of the eastern Bahamas for several hundred miles.    All this
  convective activity was east of the incipient TD-04.  (As I have stated
  earlier several times, for the early history of Atlantic/Northeast
  Pacific systems, I rely on a running tabular log of tropical waves and
  LOWs which John Wallace maintains.     John's file does not indicate
  this (the connection was likely not clear from the Tropical Weather
  Discussions), but according to Todd Kimberlain, the wave which produced
  this system was the same one which spawned Tropical Storm Beryl and
  also Pacific Tropical Storm Ileana, both forming from the southern
  extremity of the wave.)

     The convection associated with the wave decreased some on the 9th,
  but on 10 Aug had increased and become better organized.  A
  reconnaissance flight by the Hurricane Hunters investigated the area
  during the afternoon but did not find a closed low-level circulation;
  nonetheless, the system appeared to be quite well-organized.  (Most of
  the following is taken from some notes I kept on 11 and 12 Aug after
  seeing how well-organized the system looked on the morning of the 11th.
  These were based largely upon animated satellite imagery available on
  NRL's Monterrey website.)      During the evening of the 10th the
  convective pattern looked even more concentrated and organized.
  Around 11/0400 UTC a fairly tightly-wound LLCC had disengaged itself
  from the CDO-feature and was moving northeastward.     As early as
  10/2200 UTC what appeared to be curved, low-level cloud lines could be
  seen (in infrared imagery) emerging from the north side of the CDO-
  feature, and the center may have been moving out by 11/0200 UTC.  The
  convection seemed to stay in place and did not look sheared (to me),
  but the LLCC continued to move away to the northeast with a quite
  well-organized pattern of low clouds.

     By the afternoon of 11 Aug convection had flared up once more near
  the LLCC as it moved northeastward at around 13-18 kts.  This was
  mentioned in the 2130 UTC Tropical Weather Outlook from NHC, and the
  track sent to the author by David Roth begins at 1800 UTC, locating
  the center about 375 nm east-southeast of Charleston.  The convection
  waned some during the night, but by 12/1000 UTC there was a nice
  round area of deep convection centered near 38.0 N, 65.8 W, and
  this appeared to be over the LLCC.   Infrared satellite imagery from
  around 1300 to 1330 UTC on 12 Aug again depicted a circular area of
  deep convection, and visible imagery revealed low-level cloud lines
  curving into the CDO-feature.    SAB assigned a Dvorak T2.0 to the
  system at 1145 and 1745 UTC but at 2345 UTC assigned a ST1.5 (sub-
  tropical).  There was a ship report of 30-kt winds and a 1014-mb SLP
  near 32.0 N, 72.0 W at 11/1800 UTC, and more importantly, another
  ship report of 35-kt winds and a SLP of 1009.9 mb at 1200 UTC on the
  12th.  This report of gale-force winds was from a point about 150 nm
  south-southeast of the LOW's center when it was located about 375 nm
  north of Bermuda.   A low-level wind analysis from CIMSS between 1215
  and 1645 UTC depicted some 35-kt winds in the system's southern
  semicircle between 800 and 950 mb.  (Thanks to John Wallace for passing
  this information on to me.)

     The system continued to scoot on off to the northeast, and by late
  on the 12th, the deep convection had begun to weaken and the LOW began
  to merge with a cold front.   The exact nature of this system is a
  little questionable, but David Roth and Todd Kimberlain expressed the
  opinion (and the author concurs) that to them it looked like a tropical
  cyclone, and the Dvorak ratings from SAB tend to back this up.   The
  CI numbers of 2.0 would suggest 30 kts, but the 35-kt ship report well
  to the south of the LLCC implies that winds could have been stronger;
  hence, the reason for dubbing this system as "Lambda".   Hopefully,
  this system will at least be given a review to see if it might possibly
  qualify as an unnamed tropical storm.

                      Tropical Storm Beryl  (TC-05)
                             13 - 15 August

     As stated in the discussion of the possible tropical cyclone which
  raced northeastward off the U. S. East Coast on 10-12 Aug ("Lambda"),
  for the pre-warning history of most Atlantic and Eastern North Pacific
  tropical cyclones I rely on a running tabular log of all tropical waves
  and LOWs compiled and maintained by John Wallace (as well as on
  information gleaned from the regular Tropical Weather Outlooks and
  Discussions issued by TPC/NHC).   The first entry in the Tropical Wave
  file for the progenitor of Beryl depicts a wave stretching across the
  western Caribbean around 85W on 9 Aug.  However, based on a comment
  in some e-mail from Todd Kimberlain, it appears that this wave was the
  southern portion of the same wave which had spawned "Lambda" along its 
  northern extremity.   This wave had left the coast of Africa on 2 Aug
  and had tracked steadily across the Atlantic.  (This was also the same
  tropical wave responsible for the development of Tropical Storm Ileana
  in the Eastern Pacific.)

     By the early morning of 10 Aug a large area of convection had formed
  in association with the wave over the northwestern Caribbean.    The
  disturbed weather spent the next couple of days crossing the Yucatan
  Peninsula and portions of Central America, but by 12 Aug had emerged
  into the Bay of Campeche and a 1011-mb LOW had formed by 1800 UTC.  A
  reconnaissance flight by the 53rd Weather Reconnaissance Squadron of
  the U. S. Air Force Reserves investigated the area on the afternoon of
  13 Aug and found that the LOW had acquired sufficient organization to
  be upgraded to a tropical depression.   There was no well-defined LLCC
  at this point, but the plane did find FLW of 34 kts with estimated
  surface winds of 30 kts, so based upon these findings and the large-
  scale circulation evident in satellite imagery, advisories were
  initiated on TD-05 at 2100 UTC.  The poorly-defined center of the
  depression was stationary about 250 nm east of Tampico, Mexico, or
  about 300 nm southeast of Brownsville, Texas.

     Beginning during the early morning hours of 14 Aug there was an
  enormous burst of convection which proved to be sufficient to spin
  the depression up to tropical storm strength.  A reconnaissance flight
  around 1400 UTC found FLW of 53 kts in the southeast quadrant; also,
  the plane found that the center of circulation had reformed to the
  west of the previous track.   The depression was upgraded to Tropical
  Storm Beryl at 1500 UTC with the center located about 200 nm southeast
  of Brownsville or 150 nm east-northeast of Tampico.  The discussion
  bulletin noted that the system had passed over an area of unusually
  high heat content during the morning which may have been instrumental
  in the sudden strengthening of the depression.   The storm was still
  very poorly-organized, however, and a reconnaissance crew during the
  afternoon had difficulty in obtaining a center fix.   The position
  of the center indicated that Beryl was moving west-northwest at around
  7 kts, which meant that landfall would likely occur too soon for the
  storm to reach hurricane intensity.  The peak FLW winds found by the
  aircraft were still 53 kts so the intensity was held at 45 kts, which
  turned out to be the peak MSW for Beryl.

     Beryl's circulation remained broad and poorly-organized as it
  continued toward the northeast Mexican coast.  Several small convective
  bursts were noted firing on the west side of the circulation which
  resulted in the spin-up of several small vortices.   The center of
  Tropical Storm Beryl reached the coast of Mexico around 0600 UTC on
  15 Aug at a point almost exactly halfway between Brownsville and
  Tampico--about 100 nm from each city.  A reconnaissance aircraft found
  55-kt winds at 850 mb to the north of Beryl's center, and a ship near

  Tampico reported winds of 35 kts for a few hours, so the MSW was
  decreased to 40 kts for the 0900 UTC advisory.   The storm was down-
  graded to a tropical depression at 1500 UTC, and the final advisory
  was issued at 2100 UTC.  Beryl's circulation was by then beginning to
  dissipate in the mountains of northeastern Mexico about 300 km north-
  west of La Pesca.

     John Wallace has sent me some observations from various locations
  around the western Gulf of Mexico.   A CMAN near Port Aransas reported
  a peak 2-min avg southeast wind of 24 kts at 15/1000 UTC, the highest
  gust being 27 kts.   Buoy 42020 (26.9N, 96.7W) reported a southwest
  wind of 21.3 kts (8-min avg) at 15/1400 UTC with a peak gust of 27.1
  kts.  The maximum wave height reported was 3.3 m at 1100 UTC.  Another
  buoy (42002), located at 25.9N, 93.6W, recorded a maximum 8-min avg
  southeast wind of 25.2 kts at 0900 and 1200 UTC on 14 Aug with the peak
  reported gust of 31 kts occurring at 14/1200 UTC.  The lowest pressure
  in the area was generally around 1010 mb, reported at several locales.
  Rainfall was rather light, at least in southern Texas.   Brownsville
  and Corpus Christi measured 1.37 cm and 2.01 cm, respectively, in the
  48-hour period from 14/1200 to 16/1200 UTC.    Peak winds at these
  stations were in the 20-25 kt range.   Rainfall may have been heavier
  in northeastern Mexico, but the author has not received any reports
  of significant damage or casualties resulting from Tropical Storm

                       Tropical Storm Chris  (TC-06)
                               17 - 19 August

     The first mention of the tropical wave which spawned Chris was in
  the Tropical Weather Outlook issued at 2230 UTC on 14 Aug.  A large
  tropical wave was located midway between the African coast and the
  Lesser Antilles.   By the afternoon of the 15th the wave was located
  roughly 1100 nm east of the Lesser Antilles.  Thunderstorm activity
  had increased but was not concentrated.   Temperature and moisture
  genesis parameters provided by NOAA/NESDIS were favorable for some
  development over the succeeding days.  The tropical wave slowly
  gained in organization during the next couple of days as it moved
  westward.   A 1010-mb LOW formed on the wave axis on the 17th, and
  although associated convection was somewhat meager, a closed surface
  circulation was apparent and advisories were begun on TD-06 at
  2100 UTC.  The depression was located approximately 475 nm east of
  Martinique and was moving west-northwestward at 10 kts.

     By early morning of 18 Aug a persistent cluster of convection had
  formed near or to the north of the presumed location of the center.
  Convection was beginning to wrap around the LLCC by 1200 UTC and the
  satellite intensity estimates from TAFB, SAB, and KGWC at that hour
  were all 35 kts; therefore, the depression was upgraded to Tropical
  Storm Chris at 1500 UTC, located about 375 nm east of Guadeloupe.
  However, even as Chris was named cloud tops were warming and the system
  was showing signs of weakening.  A reconnaissance flight into the storm
  during the afternoon of the 18th was able to find a low-level center
  only with great difficulty.  The maximum FLW encountered was 23 kts in
  the north quadrant and the minimum CP measured by dropsonde was
  1011 mb.   Satellite imagery indicated a better developed mid-level
  circulation to the east of the broad LLCC.  Deep convection declined
  sharply, possibly due to some dry air entrainment into the storm.

     Chris was maintained as a tropical storm--barely--on the 2100 UTC
  advisory but was downgraded to a depression at 19/0300 UTC.  Some
  convection persisted into the 19th north and northeast of the center,
  but an upper-level trough to the west of the depression continued
  to induce southwesterly shearing over the system.   Even though the
  advisory package issued at 0900 UTC forecast that Chris would regain
  tropical storm intensity, a reconnaissance flight during the morning
  was unable to find a well-defined closed circulation, so apparently
  the system had degenerated into an open wave about 325 nm east of
  San Juan.  The weak remnant LOW continued moving to the west-northwest
  and was absorbed into a frontal boundary on 22 Aug.

     It is perhaps open to question as to whether Chris ever really was
  a tropical storm.   However, three satellite intensity estimates of
  35 kts argues in favor of the system having been at tropical storm
  strength early on 18 Aug.     Many tropical depressions have been
  upgraded to tropical storms on the basis of only two or sometimes even
  only one Dvorak rating of T2.5.   Eric Blake, who was employed at NHC
  at the time, has informed me that Chris will likely be considered a
  tropical storm for a six hour period.

                        Hurricane Debby  (TC-07)
                             19 - 24 August

     A tropical wave emerged from the west coast of Africa on 15 Aug and
  continued moving westward across the tropical Atlantic.  A 1010-mb LOW
  had formed by the 16th but the disturbance at that time showed no
  imminent signs of developing.       Early on 17 Aug a TWO issued by
  TPC/NHC indicated that the system, located a few hundred miles west-
  southwest of the Cape Verdes, was beginning to exhibit increased
  organization and had the potential to develop into a depression over
  the next couple of days.      The tropical wave and associated LOW
  continued to track westward with little change through the 17th and
  18th, but during the night of 18 Aug convection increased somewhat and
  this trend continued through 19 Aug.    By afternoon the system had
  developed enough circulation and organized convection for advisories
  to be initiated on TD-07, located about 875 nm east of the island of
  Barbados and estimated to be moving westward at 15 kts.

     As the 20th progressed banding features began to develop around the
  depression's center, and with good upper-level outflow, low vertical
  shear, and progressively warmer waters, the system continued to slowly
  strengthen and was upgraded to Tropical Storm Debby at 20/1500 UTC.
  Debby was centered roughly 700 nm east of Martinique and the MSW was
  estimated at 40 kts.   During the afternoon Debby's convective banding
  became better organized, but the intensity was held at 40 kts due to
  a lack of vertical alignment between the low- and mid-level circulation
  centers.    A 20/1506 UTC TRMM overpass showed a tight mid-level
  circulation or even eye-like feature in the 85 GHz (ice) data, but the
  37 GHz data and visible imagery suggested that the LLCC was located
  about 25 nm to the southwest of the mid-level center.  This lack of
  alignment in the vertical persisted over the next few days and helped
  to prevent Debby from intensifying as rapidly as most of the model
  guidance suggested.

     During the night of 20-21 Aug a large, symmetric, cold CDO feature
  developed, but due to uncertainty in the location of the center, the
  intensity was held at 45 kts.  The storm also encountered some light
  southwesterly shear which inhibited the intensification process
  somewhat.   A reconnaissance aircraft investigated Debby during the
  morning of the 21st and had a difficult time closing off a well-defined
  low-level center; nonetheless, the plane found winds of 88 kts at an
  altitude of 300 m in some convection north of the center.   Based on
  this and some other wind reports exceeding 80 kts, the MSW was
  increased to 60 kts in the 1500 UTC advisory.    The storm was moving
  just north of due west at a fairly fast clip of 19 kts.  This rather
  rapid translational speed was the primary factor causing the shear,
  resulting in the low-level circulation moving faster than the mid- and
  upper-level circulations.     Convective bursts were breaking out in
  the northeast quadrant, and with each new burst, the LLCC would
  redevelop near the burst and then move out to the west.

     A reconnaissance flight during the evening of 21 Aug reported that
  the central pressure had fallen 8 mb to 996 mb in a couple of hours.
  Also, the Guadeloupe radar showed a partial eyewall, thereby giving an
  indication that Debby might become a hurricane.   The tropical storm
  was upgraded to a hurricane around 0600 UTC on 22 Aug with the center
  located near the island of Barbuda.   The discussion bulletin noted
  that the earlier sharp drop in pressure was likely caused by a
  supercell-type thunderstorm which had developed near the center.  This
  feature soon dissipated and the Guadeloupe radar began to show the
  formation of a classic banding pattern.   An eye-like feature had been
  spinning up and spinning down in about three-hourly increments over
  the past 24 hours, and Debby appeared to be developing an eye again
  during the morning of the 22nd.   The hurricane passed over or very
  near Anguilla and was located just west of the island at 1200 UTC.
  Wind gusts to 66 kts and 52 kts were reported on St. Barthelemy and
  St. Martin, respectively, during the early morning hours of 22 Aug.
  A ragged 25-nm diameter eye was noted by the San Juan radar during
  the afternoon, and several convective bursts helped to spin up small
  eyewall mesovortices which tended to distort the overall shape of the

     Debby's center passed about 35 nm north of San Juan around 2100 UTC,
  moving west-northwest at about 18 kts.   After passing to the north of
  Puerto Rico, Debby's track began to curve more to the west due to a
  500-mb ridge to the north of the hurricane.   During an early morning
  flight into the storm a Hurricane Hunter aircraft found a minimum
  pressure of 995 mb and FLW of 74 kts northeast of the center, so Debby
  remained a hurricane for the 23/0900 UTC advisory.     The San Juan
  WSR-88D radar indicated that a series of eyewall mesovortices had
  formed and then dissipated during the night and that the eyewall
  convection had had trouble wrapping more than halfway around the
  center.   Dropsonde data indicated a 10-20 kt southerly flow at 200-
  300 mb undercutting the outflow of Debby, and a reconnaissance flight
  during the morning of the 23rd found a tight mid-level circulation
  with most of the convection displaced to the northeast.  Based on
  several GPS dropsondes indicating 55-60 kt winds north of the center,
  the MSW was decreased to 60 kts at 1500 UTC and Debby was downgraded
  to a tropical storm with the center approximately 25 nm east-northeast
  of Puerto Plata in the Dominican Republic.  During the afternoon of
  23 Aug the LLCC became separated from the mid-level circulation and
  went scooting westward along the northern coast of Hispaniola.

     Strong southwesterly shear and the high mountains of Hispaniola
  took their toll on the storm, and by 24/0000 UTC Debby was a weakening
  storm with 40-kt winds located over the northwest peninsula of Haiti.
  A reconnaissance flight during the early morning hours found a very
  poorly-defined 1011-mb center south of eastern Cuba with 35-40 kt
  winds well to the northeast.  Since some sporadic convection was still
  firing, the MSW was maintained at 35 kts for the 0900 UTC advisory.
  However, another reconnaissance plane during the mid-morning was
  unable to find a closed low-level center, so Debby was downgraded to
  an open tropical wave at 24/1500 UTC between eastern Cuba and Jamaica.
  The discussion bulletin noted that there was still an area of deep
  convection with heavy rain and winds to near tropical storm force
  near Cuba and Jamaica which would be spreading westward to the Cayman
  Islands later in the day.   Debby's remnant tropical wave continued
  moving westward for another week or more, crossing the Caribbean and
  Bay of Campeche and eventually emerging into the Eastern Pacific off
  the west coast of Mexico.  The wave was last mentioned in the Tropical
  Weather Discussions near 131W on 4 Sep.

     Storm effects of Hurricane Debby were minimal in the Leeward and
  Virgin Islands and also on Puerto Rico.   There was some disruption
  to shipping and airline schedules and of course to the tourist
  industry.  A 78-year old man in San Juan was killed as he fell off a
  roof while trying to dismantle a television antenna.   In Haiti and
  the Dominican Republic heavy tropical rains were more of a worry than
  winds.  However, it appears that while some heavy downpours fell on 
  these areas and in eastern Cuba, there were no fatalities nor major
  damage resulting from the rains.   A boat was sunk in the harbor at
  the coastal village of Carenage in Haiti.

     One of the biggest stories connected with Hurricane Debby was the
  failure of most of the numerical model guidance to correctly predict
  the dissipation of the storm.   Based for the most part on the output
  of the various models, from early on 22 Aug the 72-hour forecast
  position from the official TPC/NHC forecasts indicated a strong
  Category 1 or Category 2 hurricane on the Saffir/Simpson scale near
  or approaching the southern tip of the Florida peninsula.   This
  continued through 1500 UTC on the 23rd, which was the advisory
  package downgrading Debby to a tropical storm.     Not until the
  23/2100 UTC advisory, issued after Debby had obviously de-coupled
  during the afternoon, was this threat to Florida no longer forecast.
  The GFDL model in particular depicted a severe threat to southern
  Florida.   As late as 23/1200 UTC the GFDL was tracking a 932-mb
  hurricane near Key West.    Large numbers of tourists left the Keys
  and many residents boarded up or otherwise prepared for a hurricane.
  It is certainly to be hoped that the blown forecast in the instance of
  Hurricane Debby will not lead to complacency or apathy in connection
  with a future storm.

  NOTE:  Operationally, as noted above, Debby was upgraded to a hurricane
  at 0600 UTC on 22 Aug, and the highest MSW given for any regular or
  intermediate advisory was 65 kts.  However, the monthly summary article
  for August on TPC/NHC's website states that Debby became a hurricane
  early on 21 Aug and reached its peak estimated intensity of 75 kts
  later that day.    Apparently a re-evaluation of the reconnaissance
  report from the 21 Aug morning flight, along with other data and
  perhaps taking into account the rapid translational speed, has led the
  hurricane specialists to this conclusion which likely will be reflected
  in the official Best Track file for Debby.


  NORTHEAST PACIFIC (NEP) - North Pacific Ocean East of Longitude 180

  Activity for August:  5 tropical storms ** 
                        2 hurricanes
  ** - one of these was a "warningless" system which Mark Lander felt
       reached minimal tropical storm intensity

  NOTE:  Much of the information presented below was obtained from the
  TPC/NHC discussion bulletins issued with every regular advisory (CPHC
  for locations west of 140W.)  All references to sustained winds imply
  a 1-min averaging period unless otherwise noted.   As mentioned above,
  the write-ups for Tropical Storms Fabio and Ileana and Hurricanes Gilma
  and Hector were prepared by John Wallace.

              Northeast Pacific Tropical Activity for August

     In contrast to July when tropical cyclone activity was somewhat
  below average, the month of August was rather active in the eastern
  half of the North Pacific Ocean.   As the month opened, former
  Hurricane Daniel was a weakening tropical storm north of Hawaii.
  (See the July summary for the full report on Hurricane Daniel.)
  Five tropical storms formed east of 140W and were assigned names by
  TPC/NHC.  Of these, two--Gilma and Hector--became hurricanes.  Another
  depression in mid-month formed in subtropical latitudes just west of
  the Dateline and moved northeastward into the Central North Pacific,
  strengthened, and was named Wene by CPHC.  Additionally, another system
  late in the month southeast and south of Hawaii was not covered in
  any official warnings, but Dr. Mark Lander of the University of Guam
  sent me a track for this system which he feels briefly reached tropical
  storm intensity.  I have designated this system with the Greek letter
  "Mu".   Finally, a new tropical depression (TD-13E) formed on the last
  day of August and became Tropical Storm Kristy on 1 September.   This
  brief cyclone will be covered in the September summary.

                     Tropical Storm Fabio  (TC-08E)
                              3 - 6 August

     The origin of Fabio can be traced back to a tropical wave of
  apparent African origin that tracked off the coast on 21 Jul.  The
  wave tracked uneventfully across the Atlantic and entered the Eastern
  Pacific on the 30th.  The wave spawned a tropical LOW on 2 Aug, after
  which the convection and organization increased enough to warrant the
  LOW's upgrade to Tropical Depression Eight-E on 3 Aug at 2100 UTC about
  650 nm west-southwest of Manzanillo.  The depression tracked westward
  under the influence of a deep-layer ridge to its north.

     The tropical cyclone had trouble from the start.  Though Eight-E 
  generated strong convection, the cloud pattern indicated stiff 
  easterly shear from a very strong upper-level anticyclone north of the
  system; the low-level bands were exposed in its eastern semicircle, and
  the ill-defined LLCC was displaced from the deepest convection.  The
  unfavorable shear was not strong enough to prevent intensification, 
  however, and SSTs were adequate; a slight improvement in the cloud 
  pattern combined with QuikScat data warranted Eight-E's upgrade to 
  Tropical Storm Fabio on 4 Aug at 0300 UTC about 700 nm west of

     Fabio's deep convection remained intermittent and asymmetric, though
  a large convective burst over the LLCC allowed it to strengthen
  slightly.  The storm intensified to a MSW of 45 kts and a CP of 1000 mb
  at 1500 UTC on the 4th when located roughly 825 nm west of Manzanillo.
     This was to be Fabio's peak strength, and its organization decayed
  slowly thereafter.  The 2100 UTC advisory on the 4th indicated that the
  storm might have been weaker than it was earlier that same day, but
  Dvorak constraints and a persistent bursting pattern allowed for only
  slow weakening, which was the case through the 4th and well into
  the 5th.

     Fabio held its own surprisingly well, and since shear was forecast
  to weaken and the storm was expected to make a southward turn into
  warmer waters, re-intensification was consistently forecast.  However,
  the intermittent, sheared deep convection weakened beginning at 1500
  UTC on the 5th, and the storm embarked on a more rapid decaying trend
  as it made an expected, but somewhat erratic, west-southwestward turn.
  Fabio was downgraded to a depression at 0300 UTC on 6 Aug about 1125 nm
  west of Manzanillo as convection weakened and became more displaced
  from the center.  Soon, it was little more than a low-level vortex with
  brief bursts of convection southwest of the LLCC.   Compounded with the
  shear was the entrainment of dry air at the middle to upper levels, as
  indicated by water vapor imagery.  Even so, possible re-intensification
  was forecast right up until the last advisory, which was issued at
  2100 UTC on 6 Aug when the depression was 1250 nm west of Manzanillo.
  At this time there were signs of interaction with Tropical Storm Gilma
  to the east, and the circulation became large and amorphous.  Satellite
  data indicated winds of less than 25 kts.
     The remnants of Fabio generated intermittent convection for some
  time after the final advisory and were not absorbed by Gilma.  In fact,
  there may have been some interaction between the two cyclones,
  particularly during Gilma's weakening stage, but there is no proof of
     There were no known deaths or damage associated with Fabio.

                       Hurricane Gilma  (TC-09E)
                             5 - 11 August

     The origin of Hurricane Gilma can be traced back to a tropical wave
  that was first noted in the mid-Atlantic on 27 Jul.  The wave tracked 
  uneventfully across the Atlantic, entering the NEP basin late on 2 Aug.
  The wave generated strong convection, and a tropical LOW developed
  late on the 4th.  The organization of the LOW increased steadily, and
  QuikScat data along with impressive banding warranted its upgrade to 
  Tropical Depression Nine-E at 0300 UTC on 5 Aug about 325 nm south-
  southwest of Manzanillo.  The depression tracked initially west-
  northwestward along the periphery of a mid-level HIGH to its north.

     Nine-E was impressive, with plenty of strong convection and a good 
  cyclonic signature.  Outflow was well-developed, and overall upper-
  level conditions were favorable.  With this in mind, it is strange that
  the tropical cyclone intensified at only a modest rate.    It was
  upgraded to Tropical Storm Gilma on the second advisory, at 0900 UTC
  on 5 Aug, when it was centered some 300 nm southwest of Manzanillo.
  Gilma briefly maintained this strength, but a north-south elongation
  of the convection, a poorly-defined circulation, and multiple LLCCs
  resulted in its downgrade to a tropical depression at 2100 UTC on
  the 5th.   Easterly shear impinging on Gilma also hindered further
  development.  However, outflow remained good in all but the eastern
  quadrant.  Even the NHC was puzzled by its lack of intensification.
  Convection remained strong, but amorphous and displaced north and west
  of the center.   Occasional flare-ups of intense convection, as well
  as banding away from the center, made location of the broad center
  difficult.  A discussion at 0900 UTC on the 6th remarked that the
  easterly shear apparently had no effect on Gilma's convection.  By the
  next advisory, though, Gilma had finally pulled its structure together
  enough to be re-upgraded to tropical storm status at 1500 UTC on
  6 Aug.  Easterly shear remained a moderate negative factor, however,
  and the cyclone's forecast time over warm waters was limited.

     Gilma intensified steadily from its upgrade through 0900 UTC on the
  7th when the trend leveled off somewhat.  By the end of this period,
  Gilma was just below hurricane strength and had a strong CDO with a
  hint of a warm spot.  The SSTs were very favorable, but less-than-ideal
  upper-level conditions prevented any rapid intensification.    Gilma
  didn't attain hurricane status for a full day after strengthening to
  60 kts--not until 0900 UTC on 8 Aug, when it became Hurricane Gilma
  roughly 525 nm west-southwest of Cabo San Lucas.  The 65-kt initial
  intensity was slightly lower than the satellite estimates, based on a
  ragged 30-nm eye apparent in SSMI and TRMM imagery.    The upgrade
  occurred as upper-level conditions and outflow improved, allowing Gilma
  to become more symmetrical.     The eye quickly disappeared, but an
  improving satellite signature warranted an increase in intensity to a
  MSW of 70-kts and a CP of 984 mb at 1500 UTC on 8 Aug when Gilma was
  centered some 575 nm west-southwest of Cabo San Lucas.  This was to be
  Gilma's peak, and was maintained through the next advisory, though
  Gilma was already decaying by then as it entered cooler waters and
  entrained more stable air.

     Gilma weakened fairly rapidly, weakening to tropical storm strength
  by 0300 UTC on the 9th and to a depression by 0300 UTC on the 10th;
  meanwhile, its track bent slightly more westward as a ridge built to
  its north.  The last advisory on Tropical Depression Gilma was issued
  at 0300 UTC on 11 Aug when it was located 825 nm west of Cabo San
  Lucas.  The remnant circulation tracked westward in tandem with the
  remnants of Fabio.
     No deaths or other damage are known from Gilma; indeed, no public
  advisories were even issued for this hurricane.

                      Hurricane Hector  (TC-10E)
                             10 - 16 August

     The "pre-history" of Hurricane Hector deserves as much mention as
  the hurricane itself; it is an interesting case.  Hurricane Hector 
  originated from an African tropical wave that apparently exited the 
  African coast on 30 Jul.  It tracked uneventfully across most of the 
  central Atlantic.  However, it generated strong convection upon 
  entering the western Caribbean; indeed, a tropical LOW developed east
  of the wave on 6 Aug. It seemed that formation of a tropical 
  depression was imminent.  This was not the case, however--the tropical
  LOW apparently dissipated by the 8th, and the bulk of the disturbance
  remained over the Isthmus of Tehuantepec.  The disturbance became
  re-invigorated as it tracked off the Mexican coast as a massive 
  cyclonic disturbance.  A tropical LOW formed and was upgraded to
  Tropical Depression Ten-E the same day, at 2100 UTC on 10 Aug, some
  200 nm west-southwest of Manzanillo, Mexico.  The upgrade was based
  on satellite estimates and a report from ship ELXB9.

     The depression tracked steadily westward to the south of a ridge, 
  its convection fluctuating in a diurnal pattern.  The tropical cyclone
  boasted a large but poorly-organized envelope, and fixes were 
  initially difficult.  Intensification was slow to occur as well, 
  though overall conditions were favorable.  Information from Socorro
  Island in conjunction with satellite data indicated that Ten-E was not
  vertically aligned as of 2100 UTC on the 11th.     However, its
  organization improved enough to warrant its upgrade to Tropical Storm
  Hector in the next advisory, issued at 0300 UTC on 12 Aug, while
  located roughly 300 nm southwest of Cabo San Lucas.   A report from
  ship C6RHB of 31-kt surface winds 60 nm northwest of the center was
  considered in the upgrade.  

     Hector tracked westward, intensifying steadily through the 12th and
  into the 13th, but slightly hindered by northerly shear.     Two
  surprising developments occurred late on the 13th.   Hector reached
  minimal hurricane intensity at 2100 UTC on 13 Aug, with an estimated
  MSW of 65 kts and a CP of 987 mb, while located roughly 575 nm west-
  southwest of Cabo San Lucas.  This was to be Hector's peak intensity.
  Almost simultaneously, the storm veered abruptly northwest, off its
  previous westward track.  Neither event was forecast, though a gradual
  west-northwest turn had been expected.    The turn may have been in
  response to a weakness in the ridge north of the system.

     Hector tracked slowly northwestward, and sported a 10 to 15 nm
  diameter eye from 14/0900 UTC through 15/0300 UTC.    The system
  maintained hurricane intensity until 1500 UTC on 15 Aug, at which time
  it weakened to tropical storm strength.  A combination of southerly
  shear, stable air entrainment, and cooler SSTs began to take their
  toll on the tropical cyclone, and its deep central convection quickly
  collapsed.   It's interesting to note that as Hector's upgrade to
  hurricane status coincided with its right turn, so did its downgrade
  to a tropical storm coincide with a left turn--also an abrupt change.
  The primary steering became the low-level easterlies as convection
  weakened rapidly; the storm was a low-level vortex with no convective
  activity by 0300 UTC on the 16th.  Hector weakened to a depression,
  and the final advisory was issued the same day, at 2100 UTC on 16 Aug,
  with the dissipating center about 1100 nm west of Cabo San Lucas.
  Ship reports at this time suggested that no closed surface circulation
  was present.

     The remnants of Hector tracked westward across the Pacific and
  generated squally weather in the Hawaiian Islands on 20-21 Aug as they
  interacted with a strong upper-level trough.  No casualties or damage
  were reported from either Hawaii or Mexico in association with Hector.

                    Tropical Storm Ileana  (TC-11E)
                            13 - 17 August

  NOTE:  I have left John's summary pretty much as he wrote it.  As
  mentioned in the write-up for Tropical Storm Beryl, the wave which
  spawned Beryl and Ileana was likely traceable back to one which left
  the coast of Africa around 2 Aug.

     Tropical Storm Ileana seems to have been spawned by the same wave
  that spawned Tropical Storm Beryl in the Gulf of Mexico.  A tropical
  wave was first noted in the western Caribbean on 9 August.    It
  propagated steadily westward, generating strong convection as it
  crossed the Yucatan peninsula into the Bay of Campeche.    The wave
  crossed into the Pacific by the 13th, whereupon a tropical LOW quickly
  formed, nearly straddling the Mexican coast.   Visible satellite and
  microwave data indicated that the organization of the LOW was
  sufficient to warrant its upgrade to Tropical Depression Eleven-E at
  2100 UTC on 13 August about 100 nm south of Manzanillo.  The depression
  tracked northwest, paralleling the Mexican coast south of a ridge.  The
  Mexican government simultaneously issued a tropical storm warning for
  the coast after the upgrade, extending from Lazaro Cardenas to Cabo
  Corrientes.  The rainbands from Eleven-E impinged on the coast even as
  the warning was issued.

     Based on satellite data, the  depression was upgraded to Tropical
  Storm Ileana at 0300 UTC on 14 August while located 75 nm south-
  southwest of Manzanillo.     All factors were favorable for steady
  intensification: outflow was good, shear was relatively light, and
  SSTs were warm.  The storm maintained a northwestward track toward
  Baja California.  A tropical storm warning and hurricane watch were
  issued for Baja California at 1500 UTC on the 14th from La Paz around
  the peninsula to Todos Los Santos since hurricane intensity was
  forecast.  The corresponding warnings for southwest Mexico were dropped
  as Ileana left its vicinity.  The storm maintained a more northerly
  component than originally forecast, perhaps due to a weakness in the
  subtropical ridge; a hurricane warning replaced the tropical storm 
  warning and hurricane watch in Baja California at 0300 UTC on the 15th 
  while tropical storm warnings were issued for the rest of the peninsula
  south of 25N.

     Though overall conditions and the storm's organization were somewhat
  mercurial, Ileana intensified steadily, reaching its estimated peak MSW
  of 60 kts and lowest CP of 990 mb at 0900 UTC on 15 August about 90 nm 
  southeast of Cabo San Lucas.  However, the 60-kt peak MSW was attained 
  slightly before the lowest pressure.  Ileana finally began to make an
  expected westward turn as it interacted with a ridge to its north; a
  fortunate development, as it steered the storm away from Baja
  California.  It made its closest approach to Cabo San Lucas soon
  afterward, near 1500 UTC on the 15th when it was located roughly 45 nm
  to the south.  This distance theoretically placed Cabo San Lucas within
  the storm-force wind radii.  Even so, all warnings for Baja California
  were dropped at 2100 UTC on the 15th.
     Ileana maintained an estimated 60-kt MSW until 0900 UTC on the 16th
  when persistent northeasterly shear initiated a weakening trend,
  decoupling the LLCC from the convection.  Intensification to hurricane
  strength had been forecast up until 0300 UTC the same day.    Ileana
  weakened very rapidly; its estimated MSW dropped from 60 to 30 kts in
  only 18 hours while its central pressure rose 13 mb.   It was devoid of
  deep convection by 2100 UTC on the 16th, and was declared dissipated by
  0300 UTC on 17 August roughly 340 nm west-northwest of Cabo San Lucas.
     Ileana was a compact system; no casualties or significant damage
  are known to the author.   An Associated Press report states that Cabo
  San Lucas did get some rain from Ileana, but there was no significant
  damage aside from power grid disruptions.   Unfortunately, no useful
  surface observations from the area are known or available to the
  author.  The effects of Ileana in southwest Mexico are an unknown as
  well.  It is assumed that effects, if any, were slight.

                       Tropical Storm Wene  (TC-16W)
                              15 - 17 August

  Wene: a Hawaiian name, is the transliteration of Wayne

     Tropical Storm Wene was the second tropical cyclone in less than a
  month to be named by the Central Pacific Hurricane Center in Honolulu.
  Prior to Upana in July, the last storm to have a Hawaiian name bestowed
  upon it was Paka in December, 1997.    Very atypically for a Central
  Pacific tropical cyclone, Wene formed just west of the International
  Dateline and intensified just after entering the Central North Pacific
  moving northeastward.

     Wene's origin lay within an area of disturbed weather in the 
  subtropics which had persisted for several days in mid-August west of
  the Dateline.  An area of convection about 325 nm northwest of Midway
  Island began to develop rapidly on 15 Aug.  The first warning on TD-16W
  was issued by JTWC at 0600 UTC.    Animated satellite imagery depicted
  a well-defined LLCC with convection developing over the center.  The
  depression was tracking slowly north-northeastward and was initially
  not forecast to intensify.   By 1800 UTC the system's center was just
  east of the Dateline and the MSW was increased slightly to 30 kts.
  Satellite imagery depicted a partially-exposed LLCC with a band of
  convection extending from north to east of the center.   However, an
  amended warning was released shortly thereafter upgrading the
  depression to a tropical storm about 345 nm north-northwest of Midway.
  Multi-spectral satellite imagery indicated that the system was more
  intense than previously thought with a CDO located directly over the

     The CPHC assumed warning responsibility for the storm, issuing their
  first advisory at 16/0300 UTC and naming the system Tropical Storm
  Wene.  Dvorak intensity estimates were 45 kts, so the MSW was increased
  to that value.   At 0600 UTC Wene was located about 430 nm north of
  Midway Island and moving northeastward at 13 kts.   Animated satellite
  imagery revealed persistent deep central convection with good
  organization.   By 1200 UTC, however, Wene had begun to experience
  increased shearing due to an approaching trough in the westerlies and
  most of the convection lay in the northern half of the system.  Dvorak
  estimates were ranging from 35 to 55 kts, but the MSW was decreased
  to 40 kts based on scatterometer data.

     As Wene continued moving to the north-northeast over the next 12 to
  18 hours it maintained a well-defined circulation with some deep
  convection in spite of the shear and cooler waters.    However, by
  0600 UTC on 17 Aug the tropical storm was rapidly transitioning into
  a cold-cored extratropical LOW as it moved over even colder waters and
  began to be absorbed into an upper-level trough.   Deep convection had
  disappeared and the wind field, as depicted by scatterometer data, was
  expanding outward.   The final advisory on Wene placed the storm about
  725 nm north of Midway or about 720 nm south-southeast of Adak, Alaska.

                       Tropical Storm John  (TC-12E)
                          28 August - 1 September

     A tropical wave which was likely the precursor of Tropical Storm
  John left the African coast on 9 Aug.  The wave continued moving west-
  ward across the tropical Atlantic over the succeeding days with an
  associated tropical LOW being mentioned for several days in the
  Tropical Weather Discussions issued by TPC/NHC.  The system reached the
  eastern Caribbean Sea on 15 Aug and continued tracking to the west,
  reaching the Eastern Pacific by 19 Aug.   This information was taken
  from John Wallace's tropical wave log, which indicates that a 1009-mb
  LOW had formed along the wave near 15N, 137W, by 1800 UTC on 27 Aug.
  As best I can determine, the first mention of the pre-John disturbance
  by TPC/NHC in a Tropical Weather Outlook was early on the 27th,
  indicating that a large area of disturbed weather was located about
  1300 nm east-southeast of Hilo, Hawaii.   However, convection along
  the ITCZ in the Central and Eastern Pacific became quite active during
  late August, and Mark Lander suggested that the spate of tropical
  cyclones during this time, including John, the system described below
  ("Mu"), and Tropical Storm Kristy were not of African wave origin but
  rather had their roots in the Pacific.   This increase in tropical
  activity in the Northeast Pacific basin was possibly due to an active
  phase of the Madden-Julian Oscillation in the area.

     Mark Lander is of the opinion that the system in question was
  likely of or near tropical storm intensity by late on 27 Aug, but no
  advisories were issued until the first visible images on the 28th
  revealed that deep convection had become involved with the LLCC and
  the overall cloud pattern had become more impressive than during the
  previous evening.  The first advisory on TD-12E was issued by NHC at
  1700 UTC, locating the depression's center approximately 1650 nm west-
  southwest of Cabo San Lucas or about 1025 nm east-southeast of Hilo.
  There was some southwesterly shear over the area and strengthening
  was forecast to be slow.   However, at 28/2100 UTC the depression was
  upgraded to a 45-kt tropical storm and named John.  Visible satellite
  imagery showed a well-organized tropical cyclone with banding features
  over the eastern semicircle, and Dvorak T-numbers from TAFB had reached
  3.0.   Tropical Storm John was moving west-northwestward at 4 kts and
  was forecast to intensify to 60 kts within 36 hours.

     The MSW was increased to 55 kts six hours later based on estimates
  from TAFB and SAB.  Upper-level outflow was good to the east and
  improving to the west, due in part to the influence of the disturbance
  about 500 nm to the west ("Mu") which was helping to deflect strong
  200-mb shearing winds to the north of John.  A small CDO feature with
  -80 C overshooting tops had developed near the center, indicating that
  the storm was strengthening.  However, John's intensity leveled off
  and remained at 55 kts, likely due to some westerly flow approaching
  the storm and undercutting the outflow.  Convection weakened some on
  the 29th but made a comeback late in the day.  The storm's motion was
  being impeded by the southwesterly shear it was running into, but a
  low- and mid-level ridge to the north was strong enough to keep the
  cyclone moving on a slow west-northwesterly track.   By 0000 UTC on
  30 Aug John's center was located about 875 nm east-southeast of Hilo
  and was just west of 140W, so TPC/NHC issued its final advisory and
  warning responsibility was transferred to the CPHC in Honolulu.

     Tropical Storm John continued to move slowly westward after entering
  the Central Pacific.  The North Pacific HIGH at 45N  was centered far
  to the north of its mean position for the summer months, and this made
  for weak steering flow at 17N.   The storm maintained its intensity in
  spite of the shear, and at 30/1800 UTC the center had become hidden
  under a cold overcast and Dvorak estimates from SAB and Honolulu edged
  up to T4.0--65 kts.  The MSW was bumped up to 60 kts, which was the
  peak intensity for the storm's history.  (The minimum estimated CP of
  994 mb had occurred on the 29th.)     However, by 31/0000 UTC the
  convection had dramatically declined due to increased shear and the
  center was difficult to locate, there being uncertainty as to which
  side of 140W the center was located on.  The MSW was decreased back to
  55 kts, and six hours later the intensity was further dropped to
  45 kts.  Almost all the deep convection was gone due to the persistent
  southwesterly shear.     At this point John had been essentially
  stationary for the previous 24 hours just west of 140W.

     After 0600 UTC the weakening cyclone did drift slowly to the west
  for about 12 hours until it became stationary again at 1800 UTC.  By
  this time John was a minimal tropical storm with winds down to 35 kts.
  The storm was downgraded to a tropical depression at 0000 UTC on 1 Sep.
  The center was still stationary near the 31/1800 UTC position, and the
  CPHC discussion indicated that John was undergoing a weak Fujiwhara-
  type rotation with TD-13E (later TS Kristy) which was located about
  575 nm to the east-southeast.   The dissipating depression, consisting
  of a low-level cloud swirl with no associated deep convection, remained
  quasi-stationary on 1 Sep with scatterometer data indicating winds of
  only about 25 kts, and the final advisory on John was issued at 2100
  UTC with the center located approximately 775 nm east-southeast of

                            Tropical Cyclone "Mu"
                           26 August - 2 September

     As mentioned above in the discussion of Tropical Storm John, the
  ITCZ became active in the Central and Eastern North Pacific area in
  late August, possibly due to the active phase of a Madden-Julian
  Oscillation moving through the region.      Also mentioned in the
  discussion of John was another disturbance to the west of the tropical
  storm which, at one point, likely helped to deflect some strong 200-mb
  westerlies to the north of the storm, thereby enabling it to become
  stronger than it otherwise might have.   No advisories were issued on
  this disturbance by either NHC or CPHC, but the author received a
  track for this system from Dr. Mark Lander of the University of Guam
  who estimates that the disturbance was a minimal tropical storm for a
  36-48 hour period on 26-28 Aug.

     A Tropical Weather Outlook (TWO) issued by NHC on 17 Aug mentioned
  that an area of cloudiness and showers had developed about 475 nm south
  of the southern tip of Baja California.     This seems to be the
  parent disturbance from which the subject cyclone developed.  The
  system moved steadily westward for the next few days with a weak low-
  level circulation occasionally referred to in the TWOs.   Mark's track
  begins at 0000 UTC on 26 Aug with a 25-kt depression located roughly
  825 nm east-southeast of Hilo, Hawaii.   A TWO issued by CPHC at
  1400 UTC on the 26th indicated that convection associated with the
  system had intensified.    Mark's track indicates that the system had
  reached tropical storm intensity by 0000 UTC on 27 Aug when it was
  centered about 650 nm east-southeast of Hilo.     A TWO issued at
  27/1400 UTC noted that peripheral convection associated with the system
  had weakened since the previous evening but that new thunderstorms had
  recently fired near the center of circulation.

     The system continued to move rather slowly generally to the west.
  Mark Lander's track, which consists of only 12-hourly positions, main-
  tains the cyclone as a tropical storm through 28/0000 UTC, then down-
  grades it to a depression.   The depression passed about 300 nm south
  of the Big Island around 31/0000 UTC, and the final position in the
  track places the system about 450 nm east-southeast of Johnston Atoll
  at 0000 UTC on 2 Sep.

     In a message received along with the track, Mark writes that the
  track may be a bit crude, but his primary objective was to point out
  that scatterometer data and a strict adherence to Dvorak analysis of
  satellite imagery indicate that the system was likely a 35-40 kt
  tropical storm from around 26/1800 through 28/1800 UTC.    In another
  e-mail Mark cited a 27/2000 UTC ERS-2 pass with 30-kt wind vectors
  depicted near the center of the system.   These represent 8-min avg
  wind speeds, averaged over a pixel, thus implying that the 1-min avg
  MSW was likely around 35 kts.


  NORTHWEST PACIFIC (NWP) - North Pacific Ocean West of Longitude 180

  Activity for August:  2 tropical depressions ** 
                        3 tropical storms ++
                        3 typhoons
                        1 super typhoon

  ** - one of these was a short-lived system carried only by JMA

  ++ - one of these was treated as a tropical depression by JTWC and
       JMA but Mark Lander felt that it reached tropical storm intensity

  NOTE: Most of the information on each cyclone's history presented in
  the narrative will be based upon JTWC's advisories, and references to
  winds should be understood as a 1-min avg MSW unless otherwise noted.
  However, in the accompanying tracking document I have made comparisons
  of coordinates with JMA (Japan) and the Philippines (PAGASA) when their
  positions differed from JTWC's by usually 40-50 nm or more.  A special
  thanks to Michael V. Padua, owner of the Typhoon 2000 website, for
  sending me the PAGASA and JMA tracks.

     In the title line for each storm I plan to reference all the cyclone
  names/numbers I have available:    JTWC's depression number, the
  JMA-assigned name (if any), JMA's tropical storm numeric designator,
  and PAGASA's name for systems forming in or passing through their area
  of responsibility.

              Northwest Pacific Tropical Activity for August

     August turned out to be a very active month in the Northwest Pacific
  basin.   Six tropical storms were named by JMA with four of these
  reaching typhoon intensity.   Bilis became an intense super typhoon and
  Jelawat nearly did do (according to Mark Lander it did briefly reach
  super typhoon intensity).   All of the named cyclones eventually made
  landfall on the Asian continent except for Typhoon Ewiniar.   JTWC
  issued warnings on two additional depressions (14W and 17W), and JMA
  issued two bulletins on another tropical depression.   However, Mark
  Lander sent me alternate tracks for some of the systems, and his
  track for TD-14W assigns a peak MSW of 50 kts.    Another depression,
  TD-16W, formed just west of the Dateline and moved into the Northeast
  Pacific basin where it developed into Tropical Storm Wene.   Finally,
  Mark Lander sent a satellite picture on 30 Aug of a very tiny vortex
  in the subtropics accompanied by some deep convection.   It isn't
  exactly clear just what the nature of this "micro-midget" system was.

     In addition to the named cyclones Bilis and Kaemi, there were two
  weak tropical depressions in the NWP basin.  JTWC issued six warnings
  on a system designated as TD-17W which formed on 17 Aug about 525 nm
  west-northwest of Midway Island in an area of disturbed weather in the
  subtropics which had persisted after Tropical Storm Wene had formed
  in the same general area a couple of days earlier.   The depression
  moved erratically at first, then began to move off to the northeast.
  The last warning, issued at 19/0000 UTC, placed the center about 475 nm
  north-northwest of Midway.  Maximum winds for the system were 25 kts.

     On 20 Aug JMA mentioned a tropical depression in a couple of their
  High Seas Warning and Summary bulletins.  This system tracked eastward
  from a position about 225 nm south of Tokyo on 19 Aug.  At 20/0000 UTC
  it was located about 350 nm southeast of Tokyo, and it was at this time
  that it was first referred to as a tropical depression.  By 1200 UTC
  it was continuing to move rather quickly to the east and was described
  as a LOW.  The final reference to the system was at 1800 UTC when it
  was located about 550 nm east-southeast of Tokyo.  At my request Mark
  Lander reviewed some imagery of this system and concurred that it was
  classifiable as a 30-kt tropical depression.   Given the latitude of
  formation and the fact that JTWC never mentioned the system in their
  STWOs, it seems likely that the LOW was perhaps more of a hybrid system
  than purely tropical.

     Regarding the "micro-midget" alluded to above--the first visible
  image Mark sent was taken at 30/0530 UTC and shows a very small vortex
  centered near 30.5N, 164.5E.  The center appears to be located near
  the southern edge of a small convective mass no more than 60 nm in
  diameter.   A second visible image taken at 31/0500 UTC depicts a tiny
  vortex near 30.9N, 165.4E, and Mark indicates he checked several
  infrared pictures to make sure it was the same vortex.   The 31 Aug
  image reveals a somewhat more ragged-looking system with the convection
  having decreased in areal extent and the LLCC located near the western
  edge of the convection.   Mark estimates that the maximum winds were
  likely in the 20-25 kt range.  No track is given for this system in
  the cyclone tracks file.

                   Typhoon Jelawat  (TC-13W / TY 0008)
                           30 July - 11 August

  Jelawat: submitted by Malaysia, is the name of a freshwater carp also
           known as Sultan fish.  This tasty fish normally inhabits
           large rivers and is much sought after by gourmets.

     Typhoon Jelawat was a far-travelled typhoon which formed in the
  subtropical latitudes of the Western North Pacific a few hundred miles
  west of Wake Island and followed a long trajectory which eventually
  took it inland into China south of Shanghai by way of Okinawa.  The
  storm peaked at 125 kts--just under super typhoon intensity.  According
  to an alternate track for the early portion of Jelawat's history sent
  to me by Dr. Mark Lander of the University of Guam, the typhoon did
  briefly reach super typhoon status at 0000 UTC on 3 Aug.    Another
  interesting aspect of Jelawat was the huge variation in eye diameter.
  Early in the storm's life, during its first rapid intensification
  spurt, the typhoon displayed a tiny, pinhole eye as small as 3 nm in
  diameter at one point.   By the time Jelawat was menacing Okinawa, it
  had developed a huge eye approximately 90 nm in diameter.

     The earliest mention by JTWC of the pre-Jelawat disturbance was in
  a STWO issued at 2200 UTC on 31 Jul.   An area of convection was
  rapidly developing about 720 nm east-southeast of Iwo Jima.  A TRMM
  pass at 31/1908 UTC depicted tightly-curved convective banding.  The
  area was given a Fair development potential.   However, according to
  Mark Lander the initial development of a circulation had occurred
  on 30 Jul and several hundred miles to the east.  Mark's alternate
  track locates a weak 25-kt system about 300 nm west-northwest of Wake
  Island at 0000 UTC on the 30th.  The disturbance moved rather steadily
  to the west, reaching tropical storm intensity (per Mark's track) at
  31/0000 UTC when located about 875 nm east-southeast of Iwo Jima.
  The first JTWC warning at 0000 UTC on 1 Aug placed the center about
  675 nm east-southeast of Iwo Jima with 25-kt winds whereas Mark
  Lander's track estimates the MSW to be 55 kts at that time.  JTWC
  upgraded the depression to a tropical storm with 45-kt winds on the
  second warning (at 0600 UTC)--in Mark's opinion typhoon intensity was
  reached about this time.

     JMA officially named the cyclone Jelawat at 1200 UTC, estimating
  the maximum 10-min avg wind to be 35 kts.   JTWC's MSW estimate was
  still 45 kts at 1200 UTC but was 70 kts six hours later.    Mark
  Lander's 1200 and 1800 UTC estimates were 85 kts and 105 kts.  JMA
  did bring Jelawat to typhoon intensity by 02/0000 UTC.   This wide
  divergence in intensity estimates among various analysts seems to be
  par for the course with small, midget tropical cyclones, especially
  those developing in subtropical latitudes.   Last August there was
  one instance where simultaneous satellite current intensity estimates
  for Typhoon Tanya ranged from 25 kts to 65 kts.  There was quite a bit
  of e-mail discussion about this subject which the author had access to,
  and one likely reason for these oft-seen discrepancies (suggested by
  Lori Chappel at Darwin) is that the Dvorak rules were developed for
  normal-sized tropical cyclones and that the minimum width criteria
  might not necessarily be valid for midgets.   Also, these midgets are
  capable of intensifying and weakening at very rapid rates which break
  the normal Dvorak constraints for changes in cyclone intensity.   Last
  January with Tropical Cyclone Iris in the South Pacific (another midget
  which intensified and then weakened very rapidly), there was a great
  divergence between Dvorak estimates based upon various methods.
  Current intensity numbers based upon visible imagery analysis reached
  4.0 while simultaneously the IR-derived number was 6.0 (this from a
  JTWC Satellite Bulletin), and objective T-numbers averaged above 6.5
  for a few hours, briefly reaching 6.9 at one point.   Considering the
  extreme danger that such small, intense systems can present to any ship
  or island in their paths, further research and reconnaissance of midget
  tropical cyclones is something which is badly needed.

     To return to Typhoon Jelawat--guided by ridging to its north, the
  developing typhoon continued to move to the west-northwest.   Jelawat
  continued to intensify, reaching its estimated peak intensity of
  125 kts (per JTWC warnings) at 0600 UTC on 3 Aug when it was located
  about 160 nm east of Iwo Jima.   (According to Mark Lander's track
  Jelawat's MSW peaked at 130 kts at 03/0000 UTC.)    Deep convection
  surrounded a tiny eye only 3-nm in diameter.   The typhoon was located
  beneath a diffluent region generated by a HIGH to the northwest and a
  TUTT to the southwest.  At its peak gales covered an area slightly over
  200 nm in diameter while the radius of 100-kt winds was estimated to be
  no greater than 20 nm.  (The peak 10-min avg wind value assigned by JMA
  was 85 kts from 0000 through 1800 UTC on 3 Aug.)   After reaching its
  peak intensity Typhoon Jelawat weakened somewhat with the MSW dropping
  to 100 kts by 03/1800 UTC.  (Mark's estimate was down to 95 kts at this
  point.)  The still-intense typhoon was centered only about 25 nm
  northeast of Iwo Jima at this time.   Jelawat had been moving on a
  west-northwesterly track for a couple of days, but after passing Iwo
  Jima the storm began to move straight toward the west just north of
  the 26th parallel.

     After passing Iwo Jima Jelawat's intensity held fairly constant in
  the 90-95 kt range for about the next three days as it trekked toward
  Okinawa.  (Mark's MSW estimate was slightly higher; JMA's 10-min avg
  estimate held at 80 kts.)   A GMS-5 visible image taken at 04/0231 UTC
  (sent by Roger Edson) shows concentric eyewalls in Jelawat.  Roger's
  comments indicate that it is very unusual to see this phenonmenon in
  small typhoons.   As the typhoon continued westward the eye diameter
  began to steadily increase, jumping from 29 nm at 06/0000 UTC to 56 nm
  six hours later.  Although the diameter of the eye fluctuated some,
  decreasing to around 40 nm by 1200 UTC, it had increased again to
  64 nm by 07/0600 UTC and to a whopping 90 nm by 1200 UTC.   Gales at
  this time extended outward 170 nm to the northeast of the center and
  120 nm elsewhere while 50-kt winds covered an area about 110 nm in
  diameter.   Jelawat's MSW had increased to 100 kts on the 6th as the
  eye contracted some (Mark Lander's track estimates 110 kts), but had
  dropped slightly to 90 kts by 07/1200 UTC.

     Between 0600 and 1200 UTC on 6 Aug Typhoon Jelawat passed over the
  Japanese island of Minamidaito-jima, located about 180 nm east of
  Okinawa.   A report from Masashi Nagata, a forecaster at JMA's National
  Typhoon Center, states that the island reported a minimum pressure of
  958.9 mb at 0720 UTC.  The maximum 10-min avg wind of 75.4 kts was
  measured at 0920 UTC, and a peak gust of 119.5 kts was recorded at
  0913 UTC.  The report states that sea level pressure series at the
  island indicated very steep pressure gradients in a narrow ring just
  outside the large eye with almost uniform pressure within the eye.

     As Jelawat approached Okinawa on 7 Aug the storm turned to a north-
  westerly course which it followed for a couple of days.  As early as
  07/0000 UTC gale-force winds were being felt on Okinawa.  Convective
  tops warmed some on 7 Aug and the MSW had dropped to 80 kts by the time
  Jelawat had moved over the northeastern end of the island around 1800
  UTC.  At 07/1200 UTC a ship approximately 100 nm to the southeast of
  the center was reporting 10-min mean south-southwest winds of 39 kts.
  By 1800 UTC the huge eye was positioned over the northeastern end of
  Okinawa and was tracking northwestward at 6 kts.   Jelawat by this time
  had moved north of the upper-level ridge and into an area of increased
  vertical shear.  The 50-kt wind radii had been adjusted outward to
  over 100 nm due to the enormous eye, and gales now covered an area
  exceeding 300 nm in diameter.   Mark Lander passed along a report from
  the small island of Okinoerabu north of Okinawa.  At 08/0100 UTC winds
  were from the southeast at 71 kts (presumably a 10-min avg), gusting
  to 92 kts with a pressure of 980 mb.   Mark indicated that none of the
  wind reports from Okinawa had been all that high--Kadena had had a
  peak gust of 68 kts.   A press report received by the author mentioned
  winds to 80 kts on Okinawa, but it is unknown whether this was measured
  or estimated nor whether it represents a sustained wind or a peak gust.

     Typhoon Jelawat continued to move slowly northwestward for a couple
  of days after passing Okinawa; then, as a mid-level ridge over China
  strengthened, the storm turned back to a westerly course which it
  followed until it made landfall in China.   The intensity held steady
  at 80 kts (per JTWC's warnings) through 8 Aug, then increased to 90 kts
  for about 12 hours on the 9th as deep convection increased in the
  northeastern quadrant.  (JMA's 10-min avg wind estimate had dropped
  to 70 kts on 8 Aug and did not reflect this short-term strengthening.)
  The eye diameter remained large but not quite as large as when the
  typhoon passed over Okinawa.   As Jelawat approached the Chinese coast
  it encountered increasing vertical shear south of the subtropical
  ridge axis and slowly began to weaken.

     Landfall occurred near Shipu, about 130 nm south-southeast of
  Shanghai, around 1200 UTC on 10 Aug.  The storm was a minimal typhoon
  with 65-kt winds per JTWC's warnings; JMA estimated the maximum 10-min
  mean winds near 50 kts at landfall.   The weakening storm turned to the
  north-northwest after landfall and the final JTWC warning on Jelawat
  at 11/0600 UTC placed the dissipating depression's center about 150 km
  west of Shanghai.

     The effects of Typhoon Jelawat appeared to be minimal on Okinawa
  and in China.  On Okinawa two children were injured, and 19,000 homes
  were without electrical power, mainly in the northern city of Nago.
  The author has located no reports of injuries or fatalities in China
  as a result of the typhoon.  The primary impact seems to have been
  disruption of traffic and closure of airports and shipping ports.

     Jelawat's large eye was very unusual but not unprecedented.  In
  August, 1996, Typhoon Kirk passed directly over Okinawa with an eye
  diameter in excess of 70 nm.  The eye required 12 hours to pass over
  the island.  Also, 1996 typhoons Orson and Violet had at some point in
  their evolution eye diameters on the order of 75 nm.   However, all
  these eyes pale in comparison with that of Typhoon Carmen in 1960.
  Like Kirk and Jelawat, Typhoon Carmen passed over Okinawa.   The
  Annual Typhoon Report for 1960 states that photographs taken from a
  radar at Kadena AB show quite clearly that, with respect to wall clouds
  surrounding the eye, Carmen's eye had a diameter of approximately
  200 nm.    (The information in this paragraph was taken from Eastern
  Hemisphere Tropical Cyclones of 1996 by Mark Lander, Eric Trehubenko
  and Chip Guard, although the author has somewhere in a box buried in
  a closet the typhoon summary for 1960 (as published in Climatological
  Data, National Summary) which describes Carmen's gargantuan eye.)

                        Tropical Cyclone  (TC-14W)
                               6 - 12 August

     This system was carried as a tropical depression by JTWC and JMA,
  but an alternate track provided by Dr. Mark Lander assigns tropical
  storm intensity to the system coincident with the time span it was
  in warning status from JTWC; hence, the designation above as a generic
  tropical cyclone.  Mark's track begins a couple of days prior to the
  issuance of the first JTWC warning, locating a weak 20-kt circulation
  about 650 nm east-southeast of Iwo Jima--very near the location where
  Jelawat had reached typhoon intensity six days earlier.  The system
  moved northwestward for a couple of days and slowly became better
  organized.  During the morning of 7 Aug (local time) a MCS which had
  been associated with the disturbance collapsed, but a new one formed
  late in the day and covered the LLCC, as a visible image taken at
  07/0730 UTC shows.   Maximum winds were estimated near 30 kts at this
  time (per Mark's track).  An enhanced infrared image taken also at
  0730 UTC reveals the small cyclone with Typhoon Jelawat to the west
  and a monsoon depression (which developed into Typhoon Ewiniar) to the

     Early on 8 Aug the small system began to curve to the north.  A
  visible image taken at 08/0130 UTC reveals a partially-exposed center
  due to some shearing.   JTWC issued a Formation Alert about this time,
  followed by the first warning at 0600 UTC on the 8th.  The depression
  was located about 300 nm north-northeast of Iwo Jima at this time and
  also roughly 850 nm east of Typhoon Jelawat.     This location was
  essentially the point of recurvature for TC-14W--it did jog slightly
  to the north-northwest for awhile on 8 Aug, but soon turned to a north-
  northeasterly course and later to an east-northeasterly one.    JTWC 
  assigned a MSW of 25 kts while Mark Lander believes the disturbance
  reached minimal tropical storm intensity about this time.    A visible
  image taken at 0630 UTC reveals a partially-exposed LLCC with deep
  convection sheared about 10 nm to the northeast.  Animated water vapor
  imagery indicated that the system was located at the southern end of a
  mid-latitude trough.     JTWC increased the MSW estimate to 30 kts at
  1800 UTC where it remained for the duration of the period the system
  was in warning status.

     A visible image taken at 08/2330 UTC revealed that the center was
  either under or along the southeastern side of a tiny CDO with good
  banding evident.   The 09/0000 UTC warning from JTWC reported that
  animated satellite imagery depicted weakening of the system although
  it mentioned that the LLCC had moved beneath the convection.  The
  0600 UTC warning noted that there had been an increase in convection
  during the previous six hours.  Mark estimates that the peak intensity
  of 50 kts was reached at this time with fairly rapid weakening there-
  after.  By 09/1200 UTC the cyclone was moving around the top of a
  ridge to its southeast and was approaching an old frontal boundary.
  The final JTWC warning at 10/0000 UTC indicated that the deep
  convection associated with the system was sheared over 60 nm to the
  east of the LLCC and the depression was deemed extratropical.  Mark,
  however, contends that the system did not become extratropical but
  rather moved quickly to the east-northeast as a weak, sheared tropical
  cyclone. His track continues to follow the weakening system through
  0000 UTC on 12 Aug at which time it was located about 1200 nm north
  of Wake Island.

                   Typhoon Ewiniar  (TC-15W / TY 0009)
                              9 - 19 August

  Ewiniar: submitted by the Federated States of Micronesia, is the
           name of a Chuuk traditional storm god

     In contrast with Typhoon Jelawat which formed near the northern edge
  of the tropics, was initially a midget cyclone, and intensified very
  rapidly, Typhoon Ewiniar formed deeper in the tropics, was initially
  very large in areal extent, and intensified more slowly.  The storm
  formed near the Mariana Islands, moved generally northward to a point
  a few hundred miles south of Japan, then moved on an east-northeastward
  heading for several days, finally turning back to the north as it
  slowly weakened east of northern Honshu.

     The first mention of the disturbance from which Ewiniar developed
  was in a STWO issued by JTWC on 6 Aug.  An area of convection had
  developed about 600 nm east of Guam.  Convection was persistent but
  unorganized and there was an indication of a weak LLCC just to the
  west of some isolated deep convection.   The disturbed area moved
  steadily to the west and by 8 Aug was centered approximately 150 nm
  east of Guam.     The area had the appearance of a large monsoon
  depression with light winds near the center.  A scatterometer pass
  indicated the possibility of multiple LLCCs.   A Formation Alert was
  issued at 0251 UTC on 9 Aug, indicating that a large monsoon gyre had
  formed near the Mariana Islands.  Upper-level analysis indicated that
  an anticyclone aloft was providing good outflow over the area.

     The first JTWC warning was issued on TD-15W at 09/0600 UTC with the
  depression's center roughly 200 nm west-northwest of Guam.  The system
  intensified rather slowly initially under weak to moderate north-
  easterly vertical shear.      JMA upgraded the depression to Tropical
  Storm Ewiniar at 1800 UTC, and JTWC followed suit at 10/0000 UTC when
  the center was located about 375 nm west of Saipan in the Marianas.
  Satellite intensity estimates were 30-35 kts and there were some
  synoptic ship reports of pressures to 996 mb.     Organization had
  improved with some deep convection near the LLCC.  At 10/0600 UTC
  a SSM/I pass depicted a partially-exposed, elongated LLCC with
  convection primarily south of the center.  An ERS2 scatterometer pass
  indicated an extensive area of gale-force winds south and east of
  the system.  By this time Ewiniar was moving to the north-northwest,
  a motion which continued for a couple of days due to the steering
  influence of a subtropical ridge to the east-northeast of the cyclone.

     The JTWC warning at 11/0000 UTC mentioned that some tight convective
  banding had appeared, and outflow in the northwestern sector was
  improving as an upper-level LOW to the northwest shifted to the south-
  west along the Ryukyu Island chain.  The MSW was increased to 50 kts,
  and six hours later JTWC upgraded Ewiniar to a typhoon with 65-kt
  winds when it was located approximately 200 nm west-northwest of Iwo
  Jima.  The storm was moving north-northwestward very quickly at 29 kts,
  but this rapid forward motion soon began to subside very quickly.
  At 12/0000 UTC Ewiniar's center had become fully-exposed and the system
  was downgraded to a 55-kt tropical storm.  An upper-level LOW to the
  southwest and an upper-level HIGH to the southeast had combined to
  create an enhanced vertical shear environment.   The 0000 UTC warning
  also required a relocation of the center to a point about 90 nm south
  of the previous forecast position.  (This location was approximately
  450 nm southwest of Tokyo.)     By 0600 UTC the MSW had dropped
  further to 45 kts and Ewiniar was moving to the east-northeast at
  4 kts.  (It should be noted that JMA did not upgrade Ewiniar to a
  typhoon at this point, with the maximum 10-min avg winds being
  estimated at 55 kts.  However, JMA maintained the 10-min avg winds
  at 50-55 kts during the next couple of days when JTWC had dropped
  their reported MSW value to 45 kts.)

     By 1200 UTC on 12 Aug the upper-level LOW to the southwest of the
  tropical storm had moved farther to the west and an anticyclone was
  building to the north of the system; thus, the vertical shear began
  to lessen.    Satellite intensity estimates were primarily 35 kts on
  the 12th, but based upon some synoptic ship reports of winds to 40 kts,
  the MSW remained at 45 kts.   For the next couple of days Ewiniar was
  steered by a subtropical ridge to its southeast on a fairly brisk
  east-northeasterly course, passing about 250 nm south of Tokyo around
  0600 UTC on the 13th.  A 13/1123 UTC TRMM pass indicated that a deep
  convective band had formed to the southeast of the system.  By 14/1200
  UTC the storm was still maintaining its 45-kt intensity (JMA's 10-min
  avg winds remained at 50 kts) and was forecast to soon begin weakening
  since it appeared to be moving into an increasingly unfavorable
  vertical shear environment.

     However, the warning for 14/1200 UTC did mention that a new band of
  deeper convection was developing in the northeastern quadrant.  Then
  at 1800 UTC--surprise!  Ewiniar had moved under a region with good
  upper-level diffluence and had developed a 13-nm diameter eye.  So
  the storm was upgraded to a 65-kt typhoon centered about 390 nm east
  of Tokyo.  Six hours later the MSW estimate was upped to 75 kts based
  upon satellite intensity estimates of 77 kts.  The forward motion had
  slowed somewhat as a mid-latitude ridge to the northeast of the typhoon
  had strengthened some.   At 15/0600 UTC JMA upgraded Ewiniar to a
  typhoon.  The storm's ragged eye at this time was 20 nm in diameter,
  and had increased to 30 nm six hours later.  Ewiniar's northeastward
  motion came to a halt around 1800 UTC, and by 16/0000 UTC the typhoon
  was moving northward at around 7 kts.   Water vapor imagery indicated
  that southwesterly vertical shear was impinging on the storm and an
  eye was no longer visible in satellite imagery.   Although outflow in
  the northern and northeastern sectors seemed to improve somewhat, the
  shearing took its toll and Ewiniar was downgraded to a tropical storm
  at 16/1200 UTC by both JTWC and JMA.

     The weakening storm became caught in a region of weak steering flow
  and drifted very slowly generally in a northerly direction for the next
  few days, remaining quasi-stationary at times.   Animated satellite
  imagery revealed a tightly-wrapped LLCC with usually sparse weak
  convection.   JTWC dropped the MSW to 40 kts at 16/1800 UTC and to
  minimal tropical storm intensity of 35 kts at 17/1200 UTC.  JMA's
  10-min mean winds were generally about 10 kts higher than JTWC's MSW
  during this period.   The storm continued to slowly spin down due to
  the effects of moderate vertical shear and cooler SSTs.   By 1200 UTC
  on the 18th there was no longer any convection associated with the
  system and JTWC downgraded Ewiniar to a depression as it drifted
  slowly northwestward southeast of Hokkaido.     The final warning
  issued by JTWC at 19/0600 UTC indicated that based on upper-air
  analysis and satellite imagery, Ewiniar appeared to be an occluded
  LOW along a weak frontal boundary and hence extratropical, and was
  drifting southeastward.  JMA still reported the winds at 40 kts, but
  downgraded the storm to 30 kts and issued their final bulletin at
  1800 UTC. 

              Super Typhoon Bilis  (TC-18W / TY 0010 / Isang)
                              18 - 24 August

  Bilis: submitted by the Philippines, means speed or fleetness

     Bilis was the second typhoon of the year to reach the super typhoon
  threshold of 130 kts--the first being Super Typhoon Damrey in May.  The
  storm began deep in the tropics well east of the Philippines, and after
  moving northward for a couple of days, took off on a remarkably
  straight course to the northwest which it followed until its final
  landfall in China.    The first mention of the pre-Bilis disturbance
  was in a STWO issued by JTWC at 15/1700 UTC.  An area of convection
  had developed about 500 nm south-southeast of Guam.  Scatterometer
  data indicated a broad LLCC within a region of troughing and low
  vertical wind shear.  Convection increased and the disturbance was
  given a development potential of Fair at 0000 UTC on 16 Aug.  The 
  area moved westward on the 16th and 17th and while convection was
  still fairly disorganized, animated satellite imagery showed good
  cross-equatorial flow into the monsoon trough.

     A Formation Alert was issued early on 18 Aug, and the first warning
  on TD-18W was issued at 0600 UTC placing the center approximately 75 nm
  west-northwest of Yap or about 500 nm southwest of Guam.   Convection
  was beginning to organize rapidly around the circulation and the system
  was in a region of weak vertical shear.      The depression initially
  moved northward, gradually turning to the north-northwest.    Rapid
  intensification ensued and at 19/0000 UTC the system was abruptly
  upgraded from a 30-kt depression to a 55-kt tropical storm based
  upon satellite intensity estimates.   TS-18W was then centered about
  260 nm north-northwest of Yap or about 700 nm east of Catanduanes
  Island in the Philippines.  (JMA upgraded the system and assigned the
  name Bilis at 0600 UTC.)  By 0600 UTC Bilis was tracking to the north-
  west, guided by a mid-level ridge to its northeast.   Based upon
  satellite intensity estimates, JTWC upgraded Bilis to a typhoon at
  19/1200 UTC when it was centered roughly 550 nm east-northeast of
  Catanduanes Island.     Animated water vapor imagery depicted good
  outflow aloft in all quadrants and shear was low as the young typhoon
  tracked northwestward at 14 kts.

     The MSW was increased to 75 kts at 20/0000 UTC and a banding eye had
  become visible by 0600 UTC.      Typical of most NWP tropical cyclones
  originating in the monsoon trough deep in the tropics, Bilis was a
  fairly large storm in areal extent--gales covered a zone almost 250 nm
  in diameter.   A 30-nm irregular eye was visible by 1200 UTC and the
  MSW was increased to 90 kts.  (JMA at this point upgraded Bilis to a
  typhoon with 70-kt maximum 10-min avg winds.)   Located in a very
  favorable environment and with good outflow, Bilis steadily increased
  in intensity, reaching super typhoon status at 1200 UTC on 21 Aug
  when located approximately 325 nm east-southeast of the southern tip
  of Taiwan.   At this point Bilis exhibited a 25-nm round, cloud-free
  eye with an eye temperature of 17 C.  Winds to 50 kts extended outward
  from the center over 60 nm to the northeast, and gales covered an area
  nearly 300 nm in diameter.      (JMA's 10-min mean wind estimate had
  reached 100 kts by this time.)     Super Typhoon Bilis reached its
  estimated peak MSW of 140 kts at 21/1800 UTC and maintained this
  intensity until it made landfall in Taiwan around 24 hours later.
  JMA's maximum 10-min mean wind estimate for the storm reached 110 kts
  at 22/0600 UTC with an estimated CP of 915 mb.  Microwave imagery from
  a TRMM pass at 22/0347 UTC indicated possible concentric eyewalls.

     By 22/1200 UTC the center of Bilis had just about reached the coast
  of southeastern Taiwan.  The eye diameter had shrunk to 12 nm, and
  while satellite intensity estimates were still 140 kts, the storm was
  beginning to show signs of weakening, likely due to some interaction
  with the mountainous island it was approaching.  A 22/1009 UTC TRMM
  pass revealed concentric eyewalls with spiral convective bands wrapping
  into the center of the storm.   Bilis made landfall along the south-
  east coast of Taiwan around 1500 UTC and by 1800 UTC was located over
  the west-central part of the island about 155 km south-southwest of
  Taipei.   The typhoon was moving at around 15 kts as it made landfall
  and its forward motion increased to 18 kts while crossing Taiwan, so
  the center was over the island for no more than five or six hours.

     By 0000 UTC on the 23rd Bilis' center was well out into the Taiwan
  Strait about 155 nm west-southwest of Taipei.  There was a significant
  discrepancy in MSW estimates between the warning agencies.   JTWC's
  1-min avg MSW was 120 kts while JMA's maximum 10-min avg wind estimate
  was 65 kts.  PAGASA was in the middle with 80 kts, so that was the 
  value I reported for 23/0000 UTC in the cyclone tracks file.   Typhoon
  Bilis made landfall in China around 0300 UTC, and by 0600 UTC was
  inland about 175 km southwest of Fu Chau and weakening.  Again, a large
  difference in the reported intensity between JTWC (90 kts) and JMA
  (45 kts).   The weakening cyclone slowed in its forward motion and
  became very slow-moving in a region roughly 310 km west-southwest of
  Fu Chau.  Around 1800 UTC some new convection developed over the north-
  east coast of Guangdong province well to the southeast of the low-level
  center, but this had weakened considerably six hours later.   The
  final JTWC warning on Bilis at 24/0000 UTC, still reporting the MSW at
  35 kts, placed the dissipating center about 330 km west of Fu Chau.
  (JMA had downgraded the system to a depression and issued their final
  bulletin at 23/1800 UTC.)

     The exact center of the eye of Typhoon Bilis crossed the Taiwanese
  coast just north of the surface weather station at Cheng-Kon (WMO
  46761) located at 23.1N, 121.37E.   The station was in the eye of the
  typhoon and recorded a minimum pressure of 931.2 mb, a maximum 10-min
  avg wind of 102 kts, and a peak gust of 152 kts.  It should be noted
  that the anemometer was destroyed after the maximum wind was recorded.
  Another station, Lan-Yu (WMO 46762), located 117 km south-southeast of
  Cheng-Kon on an offshore island (22.03N, 121.53E), recorded a peak gust
  of 148 kts.   The Lan-Yu station is located on top of a hill at about
  300 m elevation.     (These observations were taken from an e-mail by
  Chun-Chieh Wu, Associate Professor in the Department of Atmospheric
  Sciences at National Taiwan University.)

     Mark Lander performed an analysis of the Cheng-Kon wind measurements
  in order to estimate the 1-min avg MSW at landfall.  Using a conversion
  factor of 1.15 to convert 10-min mean winds to 1-min mean winds yields
  a MSW of approximately 117 kts.   Working from the 152-kt gust and
  using a gust-reduction factor of 1.22 (used by JTWC) yields a MSW of
  125 kts, which is in reasonably close agreement.    Just prior to
  landfall Mark reports that Dvorak T-numbers from the satellite
  reception ground station at the University of Guam were running around
  T6.5--127 kts, which is in excellent agreement with the MSW value
  derived from the peak recorded gust.   Also, Roger Edson has pointed
  out that Cheng-Kon lay in the southern half of the eyewall, and given
  that the strongest winds in an intense typhoon are most likely to be
  occurring in the northern eyewall, and considering the fairly brisk
  forward motion, he feels that winds very possibly a good deal stronger
  than 125 kts could have occurred to the north of the station.   In
  fact imagery from the Doppler radar at Green Island at 22/1130 UTC
  indicated that the strongest winds were occurring in the northern
  eyewall.  (Incidentally, according to Mark Lander, the maximum wind
  gust ever recorded in a typhoon was 166 kts.  This has happened twice:
  once at Miyako Jima (WMO 47927) near the eye of Typhoon Cora in
  September of 1966, and the other on the Taiwanese island of Lan-Yu
  near the eye of Typhoon Ryan in September, 1995.)

     According to press reports and other information available to the
  author, Bilis' death toll in Taiwan stands at eleven.  Eight of these
  were orchard workers buried by a mudslide in the central county of
  Nantou.  Eighty persons were reportedly injured, and as of Friday,
  25 Aug, five persons were still missing--one of those being a doctor
  who was mountain climbing when the typhoon struck.   To make matters
  worse, a 5.7-magnitude earthquake struck the island the day following
  the typhoon's arrival.  About 250 houses collapsed in eastern Hualien
  county due to the strong winds of Bilis, and more than 600,000 homes
  lost electrical power in the typhoon.   Rains from the storm flooded
  approximately 40,000 hectares of rice paddies and orchards, resulting
  in agricultural losses of $48 million.

     Typhoon Bilis was much weaker when it made its final landfall in
  China, but the storm still packed quite a punch.  In the coastal city
  of Jinjiang near where the center came ashore, more than 300 farmers'
  homes were destroyed and a 100-m seawall collapsed.    Bilis dropped
  220 mm of rain on coastal Fujian province, resulting in flooding which
  sent several rivers 2-3 m above warning levels.   In Quanzhou 2300
  hectares of crops were destroyed while 310 houses collapsed and 200
  businesses were affected.   Damage estimates for the coastal city of
  Fuzhou were 500 million yuan, equivalent to 69 million U. S. dollars.
  There, 845 homes were destroyed and more than 4500 trees uprooted.
  A Beijing newspaper also reported that a tornado triggered by Typhoon
  Bilis struck villages near the city of Yueqing in the eastern Chinese
  province of Zhejiang on 23 Aug.  This tornado reportedly destroyed
  more than 50 homes and damaged 612 buildings.  There were 16 serious
  injuries and the damage was estimated at $443,000.

     Finally, Patrick Hoareau sent me some information on the heavy rains
  which fell on South Korea in late August.  Kunsan, in the southwestern
  portion of the country, recorded a 48-hour total of 468 mm ending at
  0000 UTC on 27 Aug.  The monthly average for Kunsan is 150 mm.  Patrick
  notes that, based on some animation of GMS satellite imagery, it
  appears that the Korean rains resulted from the remnants of Typhoon

                 Tropical Storm Kaemi  (TC-19W / TS 0011)
                              20 - 23 August

  Kaemi: submitted by the Republic of Korea (South Korea), means ant.
         The ant often appears in Korean fairy tales as a symbol of

     Tropical Storm Kaemi was typical of many systems which form in the
  South China Sea (the "Gulf of Mexico" of the North Pacific), developing
  off the coast of Vietnam and moving westward and inland without
  significant intensification.   An area of convection developed on
  17 Aug off the southeast coast of Vietnam in association with the
  monsoon trough extending from Vietnam into the Philippine Sea.  No
  LLCC was evident and the area was under moderate to strong vertical
  wind shear.   By the 18th a weak, elongated LLCC had become evident
  in synoptic data and a QuikScat pass.   A steady pressure drop and
  increasing convective organization led to the issuance of a Formation
  Alert at 19/0000 UTC.   The area was embedded in the monsoon trough
  with linear convergent flow south of 11N.   A 18/2201 UTC QuikScat
  pass revealed 20-30 kt winds around the periphery of the LOW with
  winds of only 10-15 kts near the center; hence, the system had the
  characteristics of a monsoon depression.

     By early on the 20th the system had shown improved organization with
  convection developing around the LLCC, so JTWC initiated warnings on
  TD-19W at 0600 UTC.   The center of the 25-kt depression was located
  about 330 nm east-southeast of Da Nang and was tracking west-
  northwestward at 5 kts.   The system was still under moderate vertical
  shear with outflow fair to the west and northeast of the LLCC.  Guided
  by a subtropical ridge to the north, TD-19W moved generally in a
  northwesterly direction for most of its life, becoming more west-
  northwesterly as it approached the coast of Vietnam.   By 21/0600 UTC
  deep convection, which had been most persistent west of the center,
  had increased in organization with a spiral band west of the LLCC
  wrapping into the southern quadrant; therefore, the MSW was increased
  to 30 kts.     The system at this stage was still a large monsoon
  depression with the 1000-mb isobar about 500 nm in diameter.   The
  21/0600 UTC synoptic reports from sites WMO 59985 and 59981, located
  about 2 degrees north of the LLCC, indicated sustained winds of 20-25
  kts with a pressure of 993 mb.

     By 1200 UTC on the 21st the system was centered approximately 170 nm
  east-southeast of Da Nang.  Spiral bands over land west of the center
  had weakened, but convection west and south of the center had
  intensified and increased in areal extent.  Synoptic ship reports
  approximately 40-50 nm southeast of the LLCC indicated sustained winds
  of 37 kts; hence, the depression was upgraded to a tropical storm.
  JMA also upgraded the system to a tropical storm at 1200 UTC, naming
  it Kaemi.   Tropical Storm Kaemi reached its estimated peak intensity
  of 45 kts (from both JTWC and JMA) at 22/0000 UTC based upon satellite
  intensity analysis.    The system was very near the coast of Vietnam
  about 60 nm east-southeast of Da Nang, and satellite imagery revealed
  an area of deep convection sheared to the southwest of a partially-
  exposed center.  A 200-mb analysis indicated fair diffluence aloft with
  moderate vertical wind shear over the system.

     Kaemi made landfall at its peak intensity of 45 kts around 0600 UTC
  on 22 Aug with the associated deep convection sheared well to the
  south of an exposed LLCC.  By 1200 UTC the system was inland about
  55 km west of Hue, Vietnam, and dissipating.    The final warning from
  JTWC at 23/0000 UTC placed the diffuse LLCC roughly 150 km west of
  Hue, just north of the Bolaven Plateau of southern Laos.   The passage
  of Kaemi brought some fairly heavy rains to Vietnam.  Da Nang recorded
  140 mm in the 24 hours ending at 21/1200 UTC, and Hue measured 89 mm
  for a 24-hour total from 21/0000 UTC through 22/0000 UTC--more than
  half the monthly average of 137 mm.  Various media sources reported
  that Kaemi brought more than 300 mm of rain to central Vietnam which
  caused extensive flooding.    Three persons died in Quang Ngai
  province, one death occurred in the province of Danang, and another
  fatality was reported in the Thua Thien Hue province where over 12,000
  hectares of rice fields were inundated.

     Also, according to media sources, a whirlwind moving across the
  Halong Bay on the 22nd sank two wooden boats carrying tourists,
  resulting in two deaths with three persons reported as missing.  (I
  assume that "whirlwind" here more than likely means a waterspout or
  small tornado which was possibly related to the passage of Tropical
  Storm Kaemi.)   On 24 Aug there were reports of more whirlwinds and a
  tornado affecting the southern provinces, primarily in the Mekong River
  delta region, with significant damage and injuries; however, these
  local storms would likely not have been directly attributable to the
  tropical storm.

     According to the Bangkok Post newspaper, the remnants of Kaemi were
  responsible for heavy rains which caused flash floods in northeastern
  Thailand.   Two residents of the village of Surin were drowned, and
  there were also two fatalities in the Trat province.    Substantial
  amounts of farmland, fruit orchards, and rubber plantations were
  ruined or damaged.  In the Warin Chamrap district four homes were
  reportedly swept away while ten other homes and two temples were
  damaged.   In the Trat province the total damage estimate was placed
  at 179,355,460 baht (Thai unit of currency).

               Typhoon Prapiroon  (TC-20W / TY 0012 / Lusing)
                          25 August - 1 September

  Prapiroon: submitted by Thailand, is the Thai god of rain

     An area of convection was noted deep in the tropics southeast of
  Guam on 22 Aug.  The area was within a region of weak vertical shear,
  and a partial QuikScat pass revealed a possible broad LLCC located in
  the monsoon trough.   The disturbed area migrated westward and was
  assigned a Fair development potential on 23 Aug.    By early on the 
  24th the disturbance was located approximately 70 nm southeast of Yap.
  Animated visible satellite imagery indicated a fully-exposed LLCC
  with deep convection to the northwest.  Synoptic observations from
  Yap indicated a 24-hour pressure fall of 3 mb with east-southeasterly
  sustained winds of 10 kts.   A Formation Alert was issued at 2230 UTC,
  upgrading the development potential to Good.

     On 25 Aug satellite imagery indicated improved organization with
  deep convection located primarily to the north of the center.  PAGASA
  initiated advisories on the system at 25/0000 UTC, naming it Tropical
  Depression Lusing.   Lusing's center was located about 600 nm east-
  southeast of Catanduanes Island, or roughly 450 nm west-northwest of
  Yap, with maximum winds (10-min avg) estimated at 30 kts.   JMA also
  began referring to the system as a tropical depression at 0600 UTC.
  There was a fair amount of difference between PAGASA's and JMA's
  coordinates (as might be expected for a weak, diffuse system), but
  Lusing generally moved slowly northward.     JTWC issued a second
  Formation Alert at 2230 UTC followed by the first warning on TD-20W
  at 26/0000 UTC.    Lusing/20W was centered approximately 400 nm east
  of Catanduanes Island at that time, moving northward at around 9 kts,
  but shortly thereafter underwent a significant acceleration to the
  north-northeast.  At 26/1200 UTC Lusing was moving north-northeastward
  at 23 kts from a location about 560 nm east-northeast of Port San
  Vicente in the Philippines.  The JTWC warning indicated that the rapid
  motion might be due in part to convection reconsolidating over a new

     By 1800 UTC Lusing/20W was located roughly 375 nm south-southeast of
  Okinawa, and the system's motion had turned to the north-northwest, but
  still at a fairly fast clip of 20 kts.     Based on satellite intensity
  estimates and a ship report of 35 kts, the depression was upgraded to a
  tropical storm at 1800 UTC and named Prapiroon by JMA.  Deep convection
  was sheared approximately 15 nm to the north and east of a partially-
  exposed LLCC.  Over the next 24 hours Prapiroon's forward motion slowed
  considerably and the storm turned increasingly toward the west-
  northwest and west as a subtropical ridge to the north strengthened.
  Vertical shear was weak and outflow aloft favorable, but the storm
  remained rather disorganized with multiple LLCCs evident.   Early on
  the 27th satellite imagery revealed a large band of convection
  extending approximately 650 nm to the southeast of the center, but by
  1800 UTC this feature was weakening and Prapiroon's center had
  separated from the band.

     At 0000 UTC on 28 Aug the storm was centered roughly 175 nm south of
  Okinawa and moving westward at 8 kts.   JTWC's MSW estimate was still
  35 kts based upon satellite intensity estimates of 30 kts and synoptic
  reports of 35 kts, and the remarks indicated that animated visible and
  infrared imagery still showed a broad circulation with smaller multiple
  LLCCs orbiting the center of the broader circulation.  Interestingly,
  JMA had increased their maximum 10-min avg wind estimate to 50 kts at
  27/1800 UTC.  By 28/1800 UTC Prapiroon was moving slowly westward from
  a position about 240 nm east-southeast of Taipei.  The MSW (per JTWC)
  had increased to 45 kts and convection was consolidating over the LLCC.
  At 0000 UTC on the 29th JTWC increased the MSW further to 55 kts.  A
  SSM/I pass at 28/2202 UTC depicted a partially-exposed LLCC at the
  northern edge of some deep convection.   Water vapor imagery indicated
  an upper-level HIGH to the northwest of the storm, resulting in poor
  outflow, and CIMSS shear analysis charts indicated weak to moderate
  northeasterly shear over Prapiroon.

     The tropical cyclone began to turn more to the northwest on 29 Aug
  and slowly became better organized.   A SSM/I pass at 29/0919 UTC
  showed a convective band wrapping in toward the LLCC from the south-
  west, and 200-mb analysis indicated that an upper-level HIGH had
  developed over the system.   The JTWC warning at 29/1200 UTC noted that
  a ship located approximately 20 nm east of the center had reported
  south-southeast winds of 50 kts (10-min avg) with a pressure of 981 mb.
  JTWC upgraded Prapiroon to a 65-kt typhoon at 1800 UTC when the storm
  was centered about 140 nm east-northeast of Taipei, moving northwest-
  ward at 10 kts.   The MSW was increased to 70 kts six hours later as
  a 29/2149 UTC SSM/I pass revealed a ragged eye 50 nm in diameter with
  convective banding in the eastern semicircle.

     By 0600 UTC on the 30th Typhoon Prapiroon was located 330 nm south-
  southwest of Cheju Do (off the coast of Korea) and moving northward at
  17 kts.  A mid-level ridge to the north was weakening and a major short
  wave trough was approaching from the west.   JMA upgraded the storm to
  a typhoon at 0600 UTC while JTWC upped their MSW estimate to the peak
  value for the storm's history, 75 kts, which was maintained for 18 hrs.
  (JMA's peak 10-min avg wind estimate for Prapiroon was 70 kts at 0000
  and 0600 UTC on 31 Aug.)   SSM/I imagery at 30/0907 UTC indicated a
  33-nm irregular eye with an impressive banding feature about 180 nm
  southeast of the LLCC.  A ship transiting beneath the convective band
  reported 10-min sustained winds of 45 kts from the south-southeast and
  7.3 m swells.    At 1800 UTC Prapiroon was located about 100 nm east of
  Shanghai and still tracking northward.

     Around 31/0000 UTC the typhoon passed about 120 nm west of Cheju Do,
  and the forward speed had increased to 19 kts.   Also, convection was
  beginning to weaken and the MSW was lowered to 70 kts.  (JMA, however,
  increased their maximum 10-min avg wind estimate from 65 to 70 kts at
  this point.)     Based on a synoptic report of 54-kt winds from
  Kosan-Ni (WMO 47185), located on Cheju Do, the 50-kt wind radius was
  increased to 85 nm in the eastern semicircle.   Gales at this time
  covered an area approximately 275 nm in diameter.   By 1200 UTC on the
  31st Prapiroon was located about 90 nm west of Seoul, South Korea, and
  was tracking north-northeastward at 22 kts.  The storm had weakened to
  a minimal typhoon with 65-kt winds (JMA had downgraded it to a 60-kt
  tropical storm), and the convection associated with the system was
  beginning to elongate to the north-northeast.   CIMSS wind shear charts
  showed moderate vertical shear over the storm with increasing shear to
  the north.

     Typhoon Prapiroon made landfall in southwestern North Korea shortly
  after 1200 UTC, and by 1800 UTC was weakening inland in North Korea
  about 115 nm north of Seoul.   Hamheung (WMO 47401), North Korea,
  reported 30-kt winds at 31/1800 UTC.   The storm continued to track
  rapidly northeastward across the Korean peninsula, moving up the
  coastal region of northeastern North Korea, and by 0600 UTC on 1 Sep
  had entered the Sea of Japan just south of Vladivostok, Russia.
  Animated infrared satellite imagery showed little deep convection,
  and no low-level circulation was evident as the system continued to
  transition into an extratropical LOW.  This was the final warning by
  JTWC, but JMA issued a couple more bulletins, finally deeming Prapiroon
  extratropical at 1800 UTC as it moved eastward across the Sea of Japan.

     Although the center of Typhoon Prapiroon remained offshore as it
  swept past eastern China, the storm brought heavy rains to some areas.
  The official Chinese news agency (Xinhua) reported that at least four
  persons were killed and 80 injured in the northern part of Jiangsu
  province.      Heavy rainfall resulted in the flooding of 363,933
  hectares of farmland, and over 7500 houses were destroyed.  Xiangshui
  county reportedly received 821 mm of precipitation--a record in the
  history of Jiangsu province.  Rainfall amounts in the Huangpu district
  and Chongming county were reported as 85 mm and 79 mm, respectively.

     While Prapiroon's center made landfall in North Korea, it was near
  enough to South Korea to cause winds of up to 58 kts in the coastal
  region of the country.  At least four persons were reported dead with
  another 21 missing following the storm.   Two boats were sunk and many
  power lines downed.    In the southern part of the nation a dike 
  ruptured, flooding residential areas and farmland with approximately
  300 persons left homeless.     In North Korea flooding in the north-
  eastern sections of the country seems to have been the major impact
  caused by the storm.  The death toll stands at 42 with most of these
  occurring in the northeastern province of South Hamgyong when rivers
  burst their banks.  There was also extensive damage to crops, and road
  and rail connections were disrupted along the east coast.  The region's
  major city, Chongjin, was flooded with up to about a metre of water
  in some sections.

     Earlier, while Prapiroon was passing through the Ryukyu Islands,
  Ishigakishima recorded 112 mm of rain in the twelve hours ending at
  0000 UTC on 30 Aug.  The monthly average for the station is 236 mm.
  (Thanks to Patrick Hoareau for sending me this tidbit of information.)

                  Tropical Storm Maria  (TC-21W / TS 0013)
                           28 August - 1 September

  Maria: submitted by the United States, is the Latin/Hispanic form of
         Mary and is popular as a Chamorro woman's name

     A STWO issued by JTWC at 2200 UTC on 26 Aug mentioned that an area
  of convection had developed approximately 45 nm east-southeast of Hong
  Kong.  The convection was disorganized and was located in an area of
  moderate northerly vertical shear.  Synoptic analysis indicated that
  a LLCC was located just inland and north of the convection.   By
  1200 UTC on the 27th animated satellite imagery revealed increasing
  organization of the cloud mass and decreasing vertical shear.  The
  development potential of the system was upgraded to Fair.  (More than
  likely a Formation Alert was issued by JTWC, but I could not locate
  one anywhere in my files.)   The first warning on TD-21W was issued
  by JTWC at 0000 UTC on 28 Aug with the center located approximately
  100 nm east-southeast of Hong Kong.   A small area of deep convection
  was organizing around a LLCC, shear was weak to moderate, and a 200-mb
  analysis showed an upper-level ridge axis just northwest of the system.

     The depression commenced a slow, generally southward, drift and
  gradually increased in organization.  By 28/1200 UTC the system was
  centered about 150 nm south-southeast of Hong Kong and was upgraded
  to Tropical Storm Maria by JMA; JTWC, however, was still estimating
  the MSW at 25 kts.  JTWC did upgrade the system to a tropical storm
  six hours later, based primarily on synoptic data.  Maria displayed
  a partially-exposed LLCC with the convection to the south.  Over the
  next 24 hours Maria continued to drift somewhat erratically to the
  south and southeast.   Convection gradually increased near the LLCC,
  and JTWC bumped the MSW up to 45 kts at 30/0000 UTC when the storm
  was centered approximately 300 nm south-southeast of Hong Kong.  A
  subtropical ridge was north of the system, and northeasterly flow
  over the storm caused most of the convection to be sheared to the
  southwest quadrant of the circulation.

     Maria's track, when plotted, looks like a slightly distorted
  "figure 8".  The low- and mid-level steering flow in the northern
  South China Sea was being influenced by Typhoon Prapiroon to the
  northeast.   The position at 30/0000 UTC was the southernmost point
  in Maria's track.  By 0600 UTC the storm had moved very slightly to
  the west-northwest, then abruptly changed course and began tracking
  slowly to the northeast and later north-northwest, completing the
  right side of the "figure 8".  The MSW was decreased back to minimal
  tropical storm intensity of 35 kts at 0600 UTC when animated visible
  imagery depicted the LLCC tucked in underneath the northeastern portion
  of the convection but also revealed another weaker, fully-exposed
  circulation about 60 nm to the northeast.   Convection was seen to
  weaken somewhat over the next few hours but had begun to increase
  again by 1800 UTC.   A TRMM pass at 30/2312 UTC located the center
  of the cyclone under the deep convection and also showed that an
  area of deep convection had formed on the southeastern side of the

     The MSW was increased to 50 kts at 31/0600 UTC based on satellite
  intensity estimates of 45 and 55 kts.  A 31/0155 UTC microwave image
  placed the center under the deep convection and also indicated a
  tight band of strong convection wrapping into the center from the
  south.  Maria was located about 120 nm southeast of Hong Kong and was
  moving northward toward the southern coast of China at around 7 kts.
  By 1200 UTC deep convection was evident in all quadrants, and the storm
  reached its peak intensity of 55 kts at this time.  (JMA's maximum
  10-min avg wind estimate remained at 35 kts until just before the
  cyclone made landfall in China when it was increased to 40 kts.)
  At 1800 UTC on the 31st Tropical Storm Maria was located just off the
  Chinese coast about 50 nm east of Hong Kong, moving north-northwestward
  at 9 kts.  The storm had maintained its intensity, and a 31/1309 UTC
  SSM/I pass indicated deep convection in a band circling the LLCC in
  all quadrants except the eastern.

     Maria made landfall shortly after 1800 UTC on 31 Aug and continued
  to track to the northwest after moving inland.  The final JTWC warning
  at 0600 UTC on 1 Sep placed the center of the dissipating storm about
  200 km north-northwest of Hong Kong.   The only report of fatalities
  available to the author indicated that more than 50 persons lost their
  lives from Tropical Storm Maria, presumably in southern China and due
  to flooding caused by storm-related rainfall.  (This information was
  gleaned from the Australian Broadcasting Corporation's website by
  Matthew Saxby, who forwarded it to me.  Thanks to Matthew for sending
  me this information.)


  NORTH INDIAN OCEAN (NIO) - Bay of Bengal and Arabian Sea

  Activity for August:  1 tropical depression **

  ** - system was briefly mentioned as a depression by IMD only

              North Indian Ocean Tropical Activity for August

     During the latter part of August several LOWs formed in the monsoon
  trough in the Bay of Bengal and were mentioned by the IMD.    One of
  these was classified as a depression on 23 Aug.   An upper-level
  cyclonic circulation was noted on 19 Aug over the Bay off the South
  Orissa coast.  This feature persisted and by 21 Aug was considered a
  well-marked low-pressure area.   Around 0600 UTC on 22 Aug the center
  was near 16.5N, 85.5E, or about 150 nm east-southeast of Visakhapatnam.
  By 23/0300 UTC the LOW had been classified as a depression and was
  located near 16.5N, 83.5E, or about 80 nm south-southeast of Visak-
  hapatnam, moving slowly in a west-northwesterly direction.  Nine hours
  later (1200 UTC) the depression's center lay near 16.5N, 82.5E, or
  about 55 nm southeast of Kakinada.   The system continued to move
  generally westward and moved inland along the North Andhra coast
  without reaching cyclonic storm intensity.  (No warnings on this
  system were issued by JTWC; in fact, I could find no TWOs which I'd
  saved for the period in question, which strongly suggests that the
  disturbance was not considered significant enough to be mentioned in
  JTWC's daily TWOs for the North Indian Ocean.)   I did not include a
  tabular track for this depression in the cyclone tracks file, although
  in hindsight I rather wish that I had; hence, the reason for including
  the coordinates in the narrative.  In IMD terminology, a depression
  usually implies maximum winds of 25 kts, while a 30-kt system is
  referred to as a deep depression.


  SOUTHWEST INDIAN OCEAN (SWI) - South Indian Ocean West of Longitude 90E

  Activity for August:  1 tropical disturbance **

  ** - this system was treated as a minimal tropical storm by JTWC

     The primary sources of information upon which the narrative is based
  are the warnings issued by the TCWC on La Reunion Island, associated
  with Meteo France, and which is the RSMC for the Southwest Indian Ocean
  basin.  However, cyclones in this region are named by the sub-regional
  centres on Mauritius and Madagascar with longitude 55E as the dividing
  line between their respective areas.  La Reunion only advises these
  centres regarding the intensity of tropical systems.   References to
  sustained winds should be understood as implying a 10-min averaging 
  period unless otherwise stated.   In the accompanying tracks file
  some position comparisons have been made with JTWC's positions, and
  warnings from JTWC were used as a source of 1-min avg MSW estimates.
  Also, the comments about satellite imagery and other sources of data
  such as SSM/I and TRMM were obtained for the most part from the JTWC

                Southwest Indian Ocean Activity for August

     Weaker tropical depressions or disturbances are not all that
  uncommon in the South Indian Ocean during the winter months.   A
  tropical depression occurred in that area in July, 1998, and there
  were a couple of systems the following September.   In early August
  of this year a system gained enough organization that the La Reunion
  TCWC issued bulletins for a couple of days.   JTWC also issued warnings
  on the disturbance.

     A report is included on Tropical Disturbance #1 (TC-01S per JTWC's
  nomenclature) .  For naming purposes the tropical cyclone season in the
  Southwest Indian Ocean runs from 1 August through 31 July.  Names for
  the 2000-2001 tropical cyclone season are:

               Ando               Jakoba             Suzy
               Bindu              Kiran              Tovo
               Charly             Lanto              Ursula
               Dera               Mathieu            Vimla
               Evariste           Nancy              Wenda
               Francois           Oda                Xino
               Gaby               Premnath           Yul
               Hans               Quirin             Zoe
               Idriss             Rakoto

                  Tropical Disturbance  (TC-01S / MFR #1)
                                1 - 3 August

     An area of convection had developed by early on 1 Aug about 400 nm
  east-northeast of Diego Garcia.  Satellite imagery depicted an increase
  in areal coverage of deep convection and a partially-exposed LLCC east
  of the convection.   A QuikScat swath indicated stronger winds over the
  western half of the system which was moving slowly westward beneath
  30-40 kt easterlies.  The La Reunion TCWC (MFR) began issuing bulletins
  on the system as Tropical Disturbance #1 at 01/0600 UTC.  The maximum
  central 10-min avg winds were estimated at 25 kts, but localized winds
  to gale force were forecast in the southern quadrant due to the
  pressure gradient with the subtropical HIGH to the south.  By 1800 UTC
  the system's organization had improved to the point that JTWC began
  issuing warnings.   A 01/1313 UTC QuikScat pass indicated 20-30 kt
  winds on the western side of the system, so the initial warning
  intensity was set at 35 kts--minimal tropical storm intensity.  The
  system was centered about 320 nm east-northeast of Diego Garcia at
  the time.

     Located north of a subtropical ridge, the disturbance moved slowly
  in a general westerly direction through 02/1200 UTC, then began to
  track southwestward at an increased pace as a mid-latitude trough
  created a weakness in the steering ridge.     Satellite intensity 
  estimates reached 45 kts from at least one agency, but the system
  remained in a moderate vertical shear environment throughout its life
  and JTWC maintained 35 kts as the warning intensity.  MFR's bulletins
  continued to report the maximum 10-min avg wind as 25 kts near the
  center, though as indicated earlier, some stronger winds were forecast
  for the southern periphery of the system.   The final JTWC warning,
  issued at 1200 UTC on 3 Aug, indicated that a LLCC could not be found
  in satellite imagery, so the system was downgraded.  MFR also issued
  their final bulletin at the same time.

     While MFR classified the system no higher than a tropical
  disturbance and JTWC treated it as a minimal tropical storm, in reality
  this does not represent as great a difference as may be supposed.  It
  is simply due to a delta of one-half T-number on the Dvorak scale
  in combination with the difference between wind averaging periods.
  While satellite intensity estimates available to JTWC ranged from T2.0
  (30 kts) to T3.0 (45 kts), the various forecasters utilized an average
  value of T2.5; i.e., 35 kts in terms of a 1-min avg MSW.     Bulletins
  from MFR clearly state that they used a Dvorak rating of T2.0 for the
  disturbance, equivalent to a 26-kt 10-min mean wind.  MFR procedures
  require that a system have 10-min mean winds exceeding 28 kts in order
  to be classified as a tropical depression, so that category is reserved
  for systems to which the agency assigns a T2.5 rating on the Dvorak

     Out-of-season tropical cyclones are not common in the South Indian
  Ocean, but moreso than in the Atlantic basin.  A tropical depression
  formed near 85E in August of 1996, and tropical depressions formed
  in July in both 1997 and 1998.   (This is per MFR's classification--
  JTWC carried these systems as tropical storms.)   Based upon JTWC's
  database, August is the least active month for the Southern Hemisphere
  as a whole with only two tropical cyclones (34 kts or higher) forming
  over the past twenty seasons.   During the 1996-1997 tropical cyclone
  season in the Southern Hemisphere a storm formed in every month,
  beginning with Lindsay in July in the Perth AOR and ending with Keli
  the following June in the South Pacific.   It should be pointed out
  that JTWC, Australia and Fiji consider the tropical cyclone year to run
  from 1 July through the following 30 June, whereas La Reunion defines
  their season as 1 August through the following 31 July.    In fact
  Philippe Caroff, Chief Forecaster at La Reunion, indicated in an e-mail
  that they were following the system described above on 31 July, but
  since it was weak, postponed initiating advisories until the date
  rolled over so it would be the first numbered disturbance of the new
  cyclone season.   (Some of the above information was taken from tables
  of Southern Hemisphere tropical cyclone seasonal statistics compiled
  by Patrick Hoareau and based upon JTWC's database.)



  Activity for August:  No tropical cyclones



  Activity for August:  No tropical cyclones


  SOUTH PACIFIC OCEAN (SPA) - South Pacific Ocean East of Longitude 160E

  Activity for August:  No tropical cyclones


                              EXTRA FEATURE

     In order to shorten the amount of typing in preparing the narrative
  material, I have been in the habit of freely using abbreviations and
  acronyms.   I have tried to define most of these with the first usage
  in a given summary, but I may have missed one now and then.  Most of
  these are probably understood by a majority of readers but perhaps a
  few aren't clear to some.  To remedy this I developed a Glossary of
  Abbreviations and Acronyms which I first included in the July, 1998
  summary.  I don't normally include the Glossary in most months in
  order to help keep them from being too long.  If anyone would like to
  receive a copy of the Glossary, please e-mail me and I'll be happy
  to send them a copy.


  AUTHOR'S NOTE:  This summary should be considered a very preliminary 
  overview of the tropical cyclones that occur in each month. The cyclone
  tracks (provided separately) will generally be based upon operational
  warnings issued by the various tropical cyclone warning centers.  The
  information contained therein may differ somewhat from the tracking and
  intensity information obtained from a "best-track" file which is based
  on a detailed post-seasonal analysis of all available data. Information
  on where to find official "best-track" files from the various warning
  centers will be passed along from time to time.

    The track files are not being sent via e-mail.  They can be retrieved
  in the following manner:

       (a) FTP to: []
       (b) Login as: anonymous
       (c) For a password use your e-mail address
       (d) Go to "data" subdirectory (Type: cd data)
       (e) Set file type to ASCII (Type: ascii)
       (f) Transfer file (Type: get remote_file_name local_file_name )
           (The files will be named with an obvious nomenclature--using
           August as an example:   aug00.tracks)
       (g) To exit FTP, type: quit

    Both the summaries and the track files are standard text files
  created in DOS editor.  Download to disk and use a viewer such as
  Notepad or DOS editor to view the files.

     The first summary in this series covered the month of October,
  1997.   If anyone wishes to retrieve any of the previous summaries,
  they may be downloaded from the aforementioned FTP site at HRD.  The
  summary files are catalogued with the nomenclature:  aug00.sum, for

    Back issues can also be obtained from the following websites
  (courtesy of Michael Bath, Michael V. Padua, Tom Berg, Michael
  Pitt, and Rich Henning):>> OR>>>>

     Another website where much information about tropical cyclones may
  be found is the website for the UK Meteorological Office.  Their site
  contains a lot of statistical information about tropical cyclones
  globally on a monthly basis.  The URL is:>


     I have discovered that JTWC now has available on its website the
  complete Annual Tropical Cyclone Report (ATCR) for 1999 (1998-1999
  season for the Southern Hemisphere).  Also, ATCRs for earlier years
  are available also.

     The URL is:>

     Also, TPC/NHC has available on its webpage nice "technicolor"
  tracking charts for the 1999 Atlantic and Eastern North Pacific
  tropical cyclones; also, preliminary storm reports for all the 1999
  Atlantic and Eastern North Pacific cyclones are now available.

     The URL is:>

  Prepared by: Gary Padgett
  E-mail:  [email protected]
  Phone:  334-222-5327 (nights & weekends) / 850-882-2594 (weekdays)


Document: summ0008.htm
Updated: 29th December 2006

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