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Monthly Global Tropical Cyclone Summary October 2006
[Summaries and Track Data] [Prepared by Gary Padgett]


                               OCTOBER, 2006

  NOTE FROM THE AUTHOR: Almost two years ago I began including links to 
  track graphics prepared by John Diebolt of Tucson, Arizona, and archived
  on his tropical cyclone website.  A few months back John experienced a 
  disk crash which resulted in a error.  He had to request assistance from
  the programmer who had written the map-generation software, but so far 
  has not been able to get the problem solved.   As a convenience to users,
  I've also recently been including links to the individual tabular tracks,
  prepared by myself, which John had archived on his website.  Now, due to
  family concerns, John has not had time to place the tracks for recent
  cyclones on the website.  I have checked the websites listed at the end
  of the summaries and found that the entire October track file has been
  archived on two of them.  The links are:>>

  (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.)


                             OCTOBER HIGHLIGHTS

   --> Atlantic very quiet--no tropical cyclones form
   --> Extremely intense super typhoon strikes northern Luzon
   --> South Pacific season gets underway early with intense tropical

                             ACTIVITY BY BASINS

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

  Activity for October:  1 hurricane **

  ** - Storm formed in September

                           Sources of Information

     Most of the information presented below was obtained from the
  various tropical cyclone products issued by the Tropical Prediction
  Center/National Hurricane Center (TPC/NHC) in Miami, Florida:
  discussions, public advisories, forecast/advisories, tropical weather
  outlooks, special tropical disturbance statements, etc.    Some
  additional information may have been gleaned from the monthly
  summaries prepared by the hurricane specialists and available on
  TPC/NHC's website.     All references to sustained winds imply a
  1-minute averaging period unless otherwise noted.

                   Atlantic Tropical Activity for October

     Following are some statistics for the Atlantic basin during the month
  of October:

                                      October          Average
        Parameter                       2006         1950 - 2005
        Named Storms (NS)                0               1.7
        Hurricanes (H)                   0               1.1
        Intense Hurricanes (IH)          0               0.4
        Named Storm Days (NSD)          2.00             9.3
        Hurricane Days (HD)             1.75             4.4
        Intense Hurricane Days (IHD)     0               0.8

     No tropical cyclones formed in the Atlantic basin during the month
  of October, 2006.  The only cyclone on the map was Hurricane Isaac on
  the first two days of the month.  Isaac had formed in late September and
  passed well to the east of Bermuda, reaching hurricane intensity at
  1200 UTC on 30 September.  The storm weakened to a tropical storm just
  before clipping southeastern Newfoundland on 2 October, and shortly
  thereafter was declared extratropical.  The report on Isaac may be found
  in the September summary, and the official TPC/NHC report on this cyclone
  is now available online.

             !!!!!!!!!!!!!!! EXTRA FEATURE !!!!!!!!!!!!!!!


     As noted in the Extra Feature in the August summary, a low-pressure
  system south of Nova Scotia in mid-July exhibited some tropical storm 
  characteristics and was being considered for inclusion in the official 
  roster of 2006 tropical cyclones as an unnamed tropical storm.   During
  the post-season analysis, the decision was made to include this system, 
  bringing the number of "named" storms for 2006 to ten.   The official 
  TPC/NHC report on this storm, as well as reports for all the Atlantic 
  storms, may be found at the following URL:>


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

  Activity for October:  2 tropical depressions **
                         2 tropical storms
                         1 hurricane

  ** - one of the non-developing tropical depressions formed in the
       Central North Pacific region

                          Sources of Information

     Most of the information presented below was obtained from the
  various tropical cyclone products issued by the Tropical Prediction
  Center/National Hurricane Center (TPC/NHC) in Miami, Florida (or the
  Central Pacific Hurricane Center (CPHC) in Honolulu, Hawaii, for
  locations west of longitude 140W):  discussions, public advisories,
  forecast/advisories, tropical weather outlooks, special tropical
  disturbance statements, etc.  Some additional information may have
  been gleaned from the monthly summaries prepared by the hurricane
  specialists and available on TPC/NHC's website.  All references to
  sustained winds imply a 1-minute averaging period unless otherwise

               Northeast Pacific Tropical Activity for October

     Following are some statistics for the Northeast Pacific basin during
  the month of October:

                                      October          Average
        Parameter                       2006         1971 - 2005
        Named Storms (NS)                3               2.0
        Hurricanes (H)                   1               1.1
        Intense Hurricanes (IH)          0               0.6
        Named Storm Days (NSD)          6.50             9.1
        Hurricane Days (HD)             1.75             4.1
        Intense Hurricane Days (IHD)     0               1.2

     The Northeast Pacific basin was somewhat quieter than normal during
  October, 2006, with the average level of activity being around 60% of
  what is normal for October.  Three named storms developed (average is
  two) and there was one hurricane, which is the average.  However, the
  number of NSD and HD was rather lower than normal and there was no
  intense hurricane.   Tropical Storms Norman and Olivia formed more or
  less simultaneously in early October well southwest of Baja California,
  but remained weak and were short-lived.   Several days after weakening
  to a remnant LOW, Norman's remnants interacted with another disturbance
  and regained depression status just off the Mexican coast.   Hurricane
  Paul became a respectable Category 2 hurricane and turned northeastward
  toward the southern tip of the Baja Peninsula, but had weakened into a
  depression before reaching the Mexican coast.   The following reports
  on the named cyclones are very brief as the official TPC/NHC reports on
  all the Eastern Pacific storms are now available online.

     Two additional non-developing tropical depressions also formed during
  October.  The final in a series of short-lived tropical depressions in
  the Central Pacific formed about 650 nm southwest of Honolulu on the
  13th and was designated Tropical Depression 04C.  Vertical shear
  proved too strong for the depression to strengthen and advisories were
  discontinued the next day.  Further east, Tropical Depression 18E formed
  well to the south of Cabo San Lucas on 26 October.  However, the
  environment was not conducive for tropical cyclone maintenance and this
  system met its demise on the 27th.

     Short reports with satellite pictures and small-scale maps for all
  the Northeast Pacific systems may be found at the following link:>

     The official TPC/NHC storm reports for the Eastern Pacific systems
  east of 140W may be found at the following URL:>

                           TROPICAL STORM NORMAN
                               9 - 15 October

     Tropical Storm Norman's origins lay with a tropical wave which emerged
  off the African coast around 21 September.  The wave marched westward
  with little convection, moving into the Eastern North Pacific on
  1 October.   During the early days of October a large and complex area
  of disturbed weather existed southwest of Mexico, and the tropical wave
  was involved with the eastern portion of the disturbance.  Farther to
  the west was located another system which became the next Eastern North
  Pacific cyclone, Olivia.   Convective organization increased and a
  tropical depression had formed by around 0000 UTC on 9 October about
  665 nm southwest of Cabo San Lucas on the southern tip of the Baja
  California Peninsula.  TD-15E moved slowly to the north-northwest and
  became a tropical storm around 1200 UTC.  After peaking at 45 kts on
  10 October, Norman came under increasingly hostile southwesterly shear
  which led to its weakening to a tropical depression later on the 10th.
  On the 11th Norman weakened into a remnant LOW situated about 460 nm
  southwest of Cabo San Lucas.

     Over the next few days the remnant LOW moved east-southeastward, then
  eastward on 14 October.  The system interacted with a broad area of
  disturbed weather near the Mexican coast, and during this time convection
  re-organized near the center of the LOW, resulting in Norman's being
  re-designated as a tropical depression at 15/0000 UTC about 175 nm south-
  southeast of Manzanillo.  Tropical Depression Norman moved northward and
  then northwestward inside the cyclonic envelope of the larger disturbance
  and abruptly dissipated late on the 15th just south of Manzanillo.
  Conventional satellite imagery suggested that Norman's center may have
  moved inland east of Manzanillo, but surface observations did not support
  a landfall.

     There were no reports of damage or casualties associated with Tropical
  Storm Norman.

  (Report written by Gary Padgett, based upon the official TPC/NHC report
  authored by Jack Beven)

                           TROPICAL STORM OLIVIA
                               9 - 12 October

     Tropical Storm Olivia, which operated concurrently with Tropical Storm
  Norman, originated from a tropical wave which had emanated out of western
  Africa on 18 September--ahead of the pre-Norman wave.  The wave moved
  rather uneventfully across the Atlantic and Caribbean with little
  associated convection.  However, upon reaching the Eastern North Pacific
  on 29 September, convection began to slowly increase.  The wave continued
  westward and by the 5th a broad low-pressure area had formed along the
  wave axis.  Moderate upper-level westerly shear, however, inhibited
  further development for a few days as the LOW continued westward.  It is
  estimated that a tropical depression had formed by 1800 UTC on 9 October,
  centered about 1180 nm west-southwest of Cabo San Lucas.  TD-16E moved
  slowly northward into a region of weaker vertical wind shear and had
  strengthened into Tropical Storm Olivia by 0600 UTC on 10 October.

     Shortly after being upgraded, Olivia accelerated northeastward and
  reached its peak intensity of 40 kts just six hours later.  However, this
  northeasterly motion carried the tropical cyclone into a region of strong
  upper-level southerly winds and drier air which caused the deep
  convection to weaken and shear away from the center.  Olivia was down-
  graded to a tropical depression at 11/1200 UTC when located about 900 nm
  west-southwest of the southern tip of the Baja Peninsula.  It then turned
  eastward and persistent strong vertical shear led to Olivia degenerating
  into a remnant LOW early in the 13th.  This LOW moved east-southeastward
  and was absorbed into the larger remnant circulation of former Tropical
  Storm Norman on 15 October.  It is considered possible that the remnants
  of Olivia may have played a role in the regeneration of Norman into a
  tropical depression off the Mexican coast a few hours later.

     There have been no reports of damage or casualties resulting from
  Tropical Storm Olivia.

  (Report written by Gary Padgett, based upon the official TPC/NHC report
  authored by Stacy Stewart.)

                               HURRICANE PAUL
                               21 - 26 October

     A tropical wave which emerged from the coast of Africa on 4 October
  was the progenitor of Hurricane Paul.   As with the tropical waves which
  had produced Tropical Storms Norman and Olivia, the pre-Paul wave also
  produced little deep convection during its sojourn across the tropical
  Atlantic and Caribbean Sea.  Crossing Central America on 18 October, the
  wave moved into a pre-existing area of disturbed weather over the Eastern
  North Pacific on the 19th.  This merger resulted in the formation of a
  larger area of convection which extended northward to the southern coast
  of Mexico.  A LOW formed on 20 October and a tropical depression was
  estimated to have developed by 0600 UTC on the 21st about 230 nm south-
  southwest of Manzanillo, Mexico.  TD-17E quickly strengthened and was
  upgraded to Tropical Storm Paul only six hours after being classified as
  a tropical depression.    A mid to upper-tropospheric ridge over Mexico
  was producing easterly shear over the cyclone, so Paul did not strengthen
  significantly for the next 24 hours.

     Late on the 22nd Paul reached the western periphery of the ridge and
  the vertical shear decreased.  The storm responded by intensifying rather
  rapidly--during the 18-hour period from 22/1800 and 23/1200 UTC Paul's
  estimated MSW increased from 45 to 90 kts.  In addition, the forward
  motion decreased as Paul began to turn toward the north.   Soon afterward
  the hurricane began to interact with a large mid to upper-level trough
  off the U. S. West Coast.   Paul began to curve onto a northeasterly
  track and the increasing westerly shear resulted in weakening beginning
  late on the 23rd.

     The center of Hurricane Paul passed just west of Socorro Island early
  on 24 October and around 24 hours later passed only about 40 nm south
  of Cabo San Lucas.  The cyclone by this time had been downgraded to a
  tropical storm, and further weakening ensued with Paul being further
  downgraded to a tropical depression at 26/0000 UTC as it approached the
  coast of mainland Mexico.   The weak system turned northward and made
  landfall along the coast near the southern end of Isla Altamura around
  0400 UTC on the 26th, dissipating a few hours later approximately 50 nm
  northwest of Culiacan.

     Four deaths were directly attributed to Paul in Mexico.  Two persons,
  including an American tourist, were swept out to sea from the southern
  tip of the Baja due to large waves and high surf kicked up by the
  weakening cyclone.  Even though only a tropical depression at landfall,
  Paul produced very heavy rainfall in Mexico, resulting in floods in the
  state of Sinaloa.  According to media reports, 5000 homes were damaged,
  resulting in 20,000 people being displaced.  Two deaths occurred in the
  municipality of Navolato where a truck was swept away by a swollen river.

  (Report written by Gary Padgett, based upon the official TPC/NHC report
  written by Jamie Rhome and Robert Berg)


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

  Activity for October:  3 tropical depressions **
                         2 tropical storms
                         1 typhoon
                         1 super typhoon

  ** - none of these classified by JTWC; one classified by PAGASA only,
       two others classified by JMA only

                          Sources of Information

     Most of the information presented below is based upon tropical
  cyclone warnings and significant tropical weather outlooks issued
  by the Joint Typhoon Warning Center of the U. S. Air Force and
  Navy (JTWC), located at Pearl Harbor, Hawaii.   In the companion
  tropical cyclone tracks file, I normally annotate track coordinates
  from some of the various Asian warning centers when their center
  positions differ from JTWC's by usually 40-50 nm or more.   All
  references to sustained winds imply a 1-minute averaging period
  unless otherwise noted.

     Michael V. Padua of Naga City in the Philippines, owner of the
  Typhoon 2000 website, normally sends me cyclone tracks based upon
  warnings issued by the Japanese Meteorological Agency (JMA) and the
  Philippines' Atmospheric, Geophysical & Astronomical Services
  Administration (PAGASA).  A very special thanks to Michael for the
  assistance he so reliably provides.
      In the title line for each storm I have referenced 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 warning responsibility.

               Northwest Pacific Tropical Activity for October

     Tropical activity in the Northwest Pacific basin was fairly normal
  in October.  Four tropical cyclones were named.  Tropical Storms Rumbia
  and Bebinca during the opening days of the month were large, loosely-
  organized monsoon depression-type tropical storms with Bebinca moving
  northward through the Philippine Sea and the concurrent Rumbia moving
  northward well east of the Marianas.   Typhoon Soulik during the middle
  decade of the month formed north of Pohnpei and moved northwestward
  toward Iwo Jima, where it stalled and intensified into a typhoon of
  moderate intensity before moving northward and recurving into the
  westerlies southeast of Japan.    Super Typhoon Cimaron was arguably
  the most intense Northwest Pacific tropical cyclone of 2006 and the
  most intense to strike the typhoon-plagued Philippine Archipelago since
  Super Typhoon Zeb in 1998.  Fortunately, the storm was rather small in
  areal extent and made landfall in an apparently sparsely-populated
  region.   Reports on all the named cyclones follow.

     As the month opened, Typhoon Xangsane was making landfall in Vietnam
  and had dissipated by the 2nd.  Three systems were classified as tropical
  depressions by various warning agencies, though not by JTWC.  A slow-
  moving low-pressure area in the vicinity of Iwo Jima was classified as
  a weak tropical depression by JMA beginning at 0000 UTC on 21 October.
  The system was drifting slowly north-northwestward and was downgraded
  to a low-pressure area by 1800 UTC the same day.   A low-pressure area
  in the South China Sea near 16.0N/113.0E was referenced as a weak
  tropical depression in JMA's High Seas Bulletin at 0600 UTC on 22 October
  but was not mentioned further.  The first of these systems was mentioned
  in JTWC's STWOs as an area with a 'poor' potential for development; the
  second wasn't referenced at all.

     Another system was briefly classified as a tropical depression by
  PAGASA and named Ompong.  Tropical Depression Ompong was in existence
  on 12-13 October, remaining quasi-stationary to the east of Luzon.
  Maximum winds estimated by PAGASA were 30 kts.  However, I could find
  no reference to this system in either JMA's bulletins or in JTWC's STWOs,
  which suggests that it was likely a broad monsoon LOW with little
  organized deep convection.   No tracks were given for Ompong nor the
  two weak JMA depressions in the companion cyclone tracks file.  The
  PAGASA track for Tropical Depression Ompong may be found at the 
  following link:>

     The online Wikipedia reports for the Northwestern Pacific cyclones may 
  be accessed at the following URL:>

                          TROPICAL STORM BEBINCA
                        (TC-19W / TS 0616 / NENENG)
                         28 September - 6 October

  Bebinca: contributed by Macau, is the name of a Macanese milk pudding
           served in the Portuguese restaurants of Macau

  A. Introduction and Storm Origins

     Tropical Storm Bebinca, known in the Philippines by the name Neneng,
  was a fairly weak tropical storm in early October which formed in the
  Philippine Sea and recurved east of Luzon.  Bebinca operated concurrently
  with Tropical Storm Rumbia farther to the east, and in its extratropical
  stages appeared to absorb the latter storm.  An area of convection formed
  and persisted just east of Guam on 27 September and was referenced in a
  STWO issued at 27/1730 UTC.  Infrared satellite imagery showed convection
  beginning to consolidate near an elongated LLCC, while an upper-level
  analysis revealed an anticyclone aloft directly over the disturbance
  providing good outflow and low vertical wind shear.   JMA identified
  the system as a weak tropical depression at 28/1200 UTC in a High Seas
  Bulletin, and by the 29th the disturbance was located approximately
  165 nm north-northeast of Yap.  A TUTT was enhancing divergence aloft,
  and Yap had experienced a drop in MSLP of 2.5 mb over the previous 24
  hours.  Given this, plus the consolidating convection and still-favorable
  environment aloft, JTWC upped the development potential to 'fair' at
  29/1500 UTC.

     The system had entered PAGASA's AOR by 0600 UTC on 1 October and that
  agency immediately initiated warnings on Tropical Depression Neneng.  Six
  hours later JTWC issued their first warning on Tropical Depression 19W,
  placing the center about 725 nm south-southeast of Okinawa and moving
  northwestward at 18 kts.  TD-19W was situated within a broad monsoon
  trough located east of the Philippines and was slow to intensify due
  to the competing influences of favorable outflow aloft and moderate
  vertical shear.   By 1800 UTC on 2 October organization had proceeded to
  the point that JTWC upgraded TD-19W to tropical storm intensity and
  placed the center about 725 nm south of Naha, Okinawa.  Six hours later
  JMA also upgraded the system to tropical storm status and assigned the
  name Bebinca.

  B. Synoptic History

     Bebinca had been essentially stationary well to the east of Luzon
  while strengthening to tropical storm intensity, but by 0600 UTC on
  3 October a pronounced northward motion had developed.   The system was
  slow to gain in intensity--JMA upped their MSW estimate to 40 kts at
  03/1800 UTC, and JTWC increased their intensity to an initial peak
  of 45 kts at 04/0000 UTC.  However, Bebinca soon began to experience
  shear with a weakening trend setting in.  At 04/1800 UTC JTWC downgraded
  Bebinca briefly to a tropical depression with the estimated center
  located about 450 nm west-southwest of Iwo Jima.  Animated infrared
  satellite imagery and a 04/1726 UTC AMSU pass depicted two possible
  LLCCs within a broad low-pressure area.  Surprisingly, just six hours
  later Bebinca was re-upgraded with its intensity set back at the peak
  of 45 kts.  This upgrade followed a relocation to the north based on
  multi-spectral satellite imagery and a 04/2115 UTC QuikScat pass.
  (Through this weakening and re-intensification episode JMA's 10-min
  avg MSW remained constant at 40 kts, which was that agency's peak
  intensity for Bebinca.  PAGASA's peak 10-min avg MSW estimate for
  Tropical Storm Neneng was 45 kts.)

     At 05/0600 UTC Tropical Storm Bebinca was located approximately
  550 nm south of Kyoto, Japan, tracking north-northeastward at 14 kts.
  The tropical storm's heading became increasingly northeastward on
  5 October.  By 1800 UTC the LLCC had decoupled from the deep convection
  and JTWC lowered the MSW to 35 kts.  Both JTWC and JMA downgraded Bebinca
  to a 25-kt tropical depression at 06/0000 UTC and issued their final
  warnings with the system centered about 300 nm northwest of Iwo Jima.
  At the same time a developing extratropical LOW was located at 32.0N/
  139.0E, or less than 200 nm north of the weakening Bebinca.  The remnants
  of Bebinca were apparently entrained into the extratropical system, which
  subsequently absorbed the remnants of Tropical Storm Rumbia as it sped

  C. Damage and Casualties

     No damage or casualties have been directly attributed to Tropical
  Storm Bebinca/Neneng, but according to the online Wikipedia report,
  the extratropical LOW which absorbed the former tropical cyclone swept
  across coastal waters of Honshu, leaving 33 persons either dead or

  (Report written by Gary Padgett)

                          TROPICAL STORM RUMBIA
                           (TC-20W / TS 0617)
                              2 - 6 October

  Rumbia: contributed by Malaysia, is the name of a type of palm tree
          which yields sago.  The tree commonly grows along riverbanks,
          in swampy areas, or in areas near water.

  A. Introduction and Storm Origins

     Tropical Storm Rumbia, like its partner Bebinca, was a large, loosely-
  organized tropical cyclone with monsoon depression characteristics.
  Both systems featured a large outer circulation with massive deep
  convection located relatively distant from the center.   In the final
  days of September disturbed weather covered a large area extending from
  north of Pohnpei northward and well east of the Marianas.  A STWO issued
  by JTWC at 29/1500 UTC mentioned an area of convection which had
  persisted just north of Pohnpei.   A 29/0751 UTC QuikScat pass had
  revealed an elongated LLCC with associated deep convection.  During
  subsequent days the main center of action seemed to migrate generally
  northward with favorable divergence aloft but with moderate vertical
  shear.  At 1800 UTC on 2 October JMA upgraded the system to a 30-kt
  tropical depression located approximately 450 nm east-southeast of the
  northernmost Mariana Islands.  A STWO issued by JTWC around the same
  time noted that a 02/0737 UTC QuikScat pass had indicated a developing
  LLCC on the eastern periphery of the monsoon trough with 20-kt westerly
  winds southwest of the center and sea level pressures near 997 mb.  JTWC
  at that time upped the potential for development to 'fair'.

  B. Synoptic History

     JMA upgraded the depression to Tropical Storm Rumbia at 1200 UTC on
  3 October with the center about 500 nm east of the northern Marianas.
  A few hours later JTWC issued a TCFA for the system, noting that the
  system lay under a 200-mb LOW with significant dry air over the western
  semicircle and weak to moderate vertical shear.   Rumbia continued slowly
  northward and JMA upped the winds to the peak of 45 kts (10-min avg) at
  04/0000 UTC with the large cyclone centered approximately 475 nm east-
  northeast of the northernmost Marianas.   The intensity was based upon
  an earlier QuikScat pass which had indicated legitimate 40-45 kt winds
  in the northeastern quadrant.  According to Mark Lander, QuikScat winds
  are closer to a 10-min avg more so than a 1-min avg.  JTWC at this point
  had still not initiated warnings on Rumbia, and did not do so until
  04/1800 UTC when the first warning on Tropical Depression 20W was
  issued.  The system was then centered approximately 600 nm east of Iwo
  Jima and plodding northwestward.  (JTWC had issued two TCFAs on the
  developing system: one at 03/1700 UTC and the second at 04/1630 UTC.)

     QuikScat data continued to report winds above gale force extending
  outward for hundreds of miles.  Observations from the ship Liberty Eagle
  around 0000 UTC on 5 October of winds of 37 to 44 kts corroborated the 
  QuikScat winds.  JTWC finally upgraded Rumbia to a minimal tropical storm
  at 05/1200 UTC.  However, they never raised the MSW above 35 kts and
  maintained Rumbia as a tropical storm for only 12 hours.   Rumbia began
  to accelerate northward and weaken late on the 5th.  JTWC downgraded the
  cyclone to a tropical depression at 06/0000 UTC with the center located
  560 nm east-northeast of Iwo Jima and moving northward at 18 kts.  At
  the same time JMA lowered their MSW estimate to 40 kts, but six hours
  later downgraded Rumbia to a 25-kt dissipating depression.  The LLCC
  had become completely exposed and was rapidly deteriorating.  The
  remnants of Rumbia were ultimately absorbed into the same extratropical
  LOW which had absorbed the remnants of Tropical Storm Bebinca.

     As noted above JMA's peak estimated MSW for Rumbia was 45 kts (10-min
  avg) with minimum CP estimated at 985 mb.

  C. Damage and Casualties

     No reports of damage or casualties resulting from Tropical Storm
  Rumbia have been received.

  D. Additional Discussion

     Rumbia was a very unusual case in that the intensity estimates
  assigned by JMA were consistently higher than those assigned by JTWC.
  As noted in the narrative above, QuikScat data in addition to ship
  observations revealed the existence of winds in the 40-45 kt range,
  so in the author's opinion, the JMA estimates should be considered
  as the more representative of the system's intensity.

     Rumbia was one of those not-too-infrequent Western Pacific systems
  of monsoon origin which just do not "behave" according to the Rules of
  Proper Behavior for Young Tropical Cyclones according to the Dvorak 
  method.  Mark Lander has pointed this out time after time over the years.
  Based on the observed intensity Rumbia should have been earning Dvorak 
  ratings of around T3.0.    However, the CI numbers from AFWA and JTWC 
  remained at T2.0, except around 1800 UTC on 5 October, when they reached
  T2.5 just before the system began to shear apart.   Also, in the earlier
  stages the numbers from SAB were at T2.0, but early on the 4th the
  SAB analyst assigned a ST2.5 rating using the Hebert-Poteat method for
  subtropical cyclones.  Rumbia was not a subtropical system, but exhibited
  some characteristics of subtropical cyclones such as a lack of deep
  convection near the center and a large band well to the east of the LLCC.

     However, it is still somewhat surprising that JTWC based their
  intensity estimates only on satellite analysis and ignored the valid
  QuikScat data and ship reports.  Another interesting thing--the NWS
  forecast office on Guam issues warnings for many of the islands in the
  Marianas and Micronesian groups.   Normally, the Guam Weather Forecast
  Office (WFO) utilizes the MSW value reported in JTWC's warnings.  However,
  in the case of Rumbia, they deviated from this practice.  The first
  two Guam WFO advices, issued at 04/2100 and 05/0300 UTC, respectively, 
  estimated the MSW at 45 kts.  This was prior to JTWC upgrading Rumbia
  to minimal tropical storm status.  According to one of the Guam WFO
  forecasters, they normally do follow JTWC but in this case felt the
  observations warranted doing otherwise.  In his words, one "needs to
  remember:  the Dvorak technique makes a good servant but a bad master."

     Here's another interesting observation from Mark Lander posted on
  4 October, during the period in which Tropical Storms Bebinca and Rumbia
  were operating to the west and east of Guam, respectively:

  "Southwesterly monsoon winds have been blowing for several days on Guam.
  We have had upwards of 8 inches of rain in a 4-day period.  Very thick
  smog has overspread our region as a result of the monsoon trajectory
  bringing us thick smog from Indonesia (caused by seasonal slash-and-burn
  activities there).  The thick aerosol load has an interesting side effect
  of enhancing the lightning efficiency of the showers and squalls in the
  monsoon flow."

  (Report written by Gary Padgett)

                             TYPHOON SOULIK
                           (TC-21W / TY 0618)
                             8 - 17 October

  Soulik: contributed by the Federated States of Micronesia, is a
          traditional Pohnpei Chief's title

  A. Introduction and Storm Origins

     Typhoon Soulik was a mid-October typhoon of moderate intensity which
  stalled near Iwo Jima as it reached typhoon intensity and later recurved
  harmlessly out to sea to the southeast of Japan.  On 6 October an area
  of convection had developed approximately 130 nm north-northeast of
  Kwajalein.  There was an area of cyclonic shear at the surface attended
  by some flaring convection; however, there was no evidence of a LLCC at
  the time.   A surface circulation gradually took shape and JMA began
  referencing the system as a tropical depression at 1200 UTC on 8 October
  in their High Seas Bulletins.  JTWC issued a TCFA for the disturbance
  at 08/1630 UTC, placing the center about 310 nm north-northeast of
  Pohnpei.  A TRMM pass at 08/1349 UTC had revealed banding convection
  wrapping into the northern periphery of a consolidating LLCC.  An upper-
  level analysis showed an anticyclone aloft and a TUTT cell to the north-
  west of the disturbance.  These two features were combining to facilitate
  dual poleward and equatorward outflow channels with low vertical shear.

     The first JTWC warning on Tropical Depression 21W was issued at 0000
  UTC 9 October, placing the center about 770 nm east of Guam and tracking
  northwestward at 15 kts.  TD-21W was upgraded to a tropical storm at
  1200 UTC as it tracked along the southwestern periphery of a subtropical
  ridge anchored north of Wake Island.   At 09/1800 UTC JMA upgraded the
  system to tropical storm status and assigned the name Soulik.

  B. Synoptic History

     The newly-christened tropical storm's intensification proceeded at a
  somewhat slow rate due to restricted outflow and moderate vertical wind
  shear as Soulik moved steadily on a northwesterly trajectory which
  gradually became west-northwesterly.  By 1200 UTC on 10 October Soulik's
  winds had reached 55 kts with the storm centered about 360 nm northeast
  of Saipan.  The MSW remained at around 55-60 kts for two full days as
  the cyclone moved in the direction of Iwo Jima, tracking along the
  southwestern periphery of a subtropical ridge (STR) centered north of
  Wake Island.  Another STR to the west of the tropical cyclone had begun
  to build northward, forcing the system to track more to the north-
  northwest.  In addition a passing mid-latitude shortwave trough had
  created a weakness in the STR to the northeast of the storm, enhancing
  the more northerly track.

     The primary inhibiting influence on Soulik's intensification had been
  significantly-reduced poleward outflow.  A poleward outflow channel had
  developed by the 12th and accordingly Soulik reached typhoon intensity
  at 12/1200 UTC while centered only 80 nm south of Iwo Jima, moving north-
  northwestward at 7 kts.  Due to a "tug-of-war" between the eastern and
  western STRs, Typhoon Soulik moved little as it intensified to its peak
  intensity of 90 kts.  Twenty-four hours after attaining typhoon status,
  the storm was quasi-stationary only about 55 nm south-southwest of the
  island of Iwo Jima.  As the STR to the west began to weaken and another
  mid-latitude trough approached, the storm began to slowly nudge
  northward.  The closest approach to Iwo Jima came around 14/0600 UTC
  when the center of Soulik's eye was placed only 20 nm west of the island.
  Based on JTWC's warning at that hour, the island would have been within
  the radius of typhoon-force winds.

     By 14/1200 UTC Typhoon Soulik was located about 50 nm north-northwest
  of Iwo Jima and the heading had begun to bend a little to the north-
  northeast at 7 kts.    Some strong westerlies associated with the
  approaching trough were beginning to impinge on the typhoon's north-
  western quadrant, and the intensity was lowered to 80 kts.  By 15/0000
  UTC Soulik was located approximately 170 nm north of Iwo Jima and moving
  north-northeastward at 13 kts.  The MSW was estimated at 75 kts, and
  there were signs that the cyclone was beginning extratropical transition
  with stratocumulus in the western quadrants and a notch of drier air
  intruding into the southern quadrants.   Soulik continued to accelerate
  to the northeast and weaken as the 15th progressed.  The storm was down-
  graded to a 60-kt tropical storm at 1200 UTC, and JTWC declared Soulik
  extratropical and issued their final warning at 1800 UTC.  The system
  was then located roughly 400 nm southeast of Tokyo and racing north-
  eastward at 27 kts.  JMA maintained Soulik as a typhoon through 1800
  UTC, and then as a tropical storm for another 12 hours, finally declaring
  the system extratropical at 16/1200 UTC.  The storm continued moving
  rapidly eastward, crossing the Dateline around 1600 UTC on 17 October.
  The final reference to the system in JMA's High Seas Bulletins placed
  a weakening 35-kt gale far to the south of the Aleutians at 17/1800 UTC.

     The maximum 10-min avg MSW assigned to Typhoon Soulik by JMA was
  75 kts with an attendant minimum CP of 955 mb.

  C. Meteorological Observations

     As noted above, Typhoon Soulik was essentially stalled very near Iwo
  Jima at the time of its peak intensity, and based upon JTWC's wind radii,
  the island should have experienced sustained typhoon-force winds.
  However, no synoptic observations have been received by the author.  The
  online Wikipedia report states that 205 mm of rainfall was recorded on
  Pagan Island in the Marianas in association with Soulik.

  D. Damage and Casualties

     No reports of damage of casualties resulting from Typhoon Soulik have
  been received.

  (Report written by Gary Padgett)

                           SUPER TYPHOON CIMARON
                        (TC-22W / TY 0619 / PAENG)
                          26 October - 6 November

  Cimaron: contributed by the Philippines, is the name of a Philippine
           wild ox

  A. Introduction and Storm Origins

     Cimaron was the third of six typhoons to strike the Philippine
  Archipelago during 2006, and although the most intense, it was not the
  deadliest.   The cyclone was also the fifth of six typhoons during 2006
  to reach JTWC's super typhoon threshold of 130 kts--not counting Ioke
  which was a visitor from the Central North Pacific and entered the
  Northwest Pacific basin already at super typhoon intensity on 27 August.
  (There is a distinct possibility that Typhoon Chebi in November also
  reached super typhoon status, but it was not officially upgraded

     An area of convection developed on 24 October near 13.0N/150.0E, or
  approximately 320 nm east of Guam.  Convection was flaring over an area
  of low-level cyclonic shear, and upper-level conditions were favorable
  with good divergence and low vertical shear.   By the next day the
  primary area of disturbed weather was relocated to the south-southwest
  of Guam.  A LLCC appeared to be consolidating, and the environment was
  still favorable for cyclogenesis.   At 0600 UTC on the 26th JMA began
  to classify the system as a weak tropical depression, and six hours later
  upped the winds to 30 kts.  The system was by now roughly a couple
  hundred miles to the north of Yap with improving poleward outflow.  JTWC
  issued a TCFA around 1300 UTC, and the first warning on Tropical
  Depression 22W was issued at 26/1800 UTC.  The center of TD-22W was then
  located about 750 nm east of Manila, tracking west-northwestward at
  11 kts.  JTWC upgraded the depression to a tropical storm at 27/0000 UTC,
  and at the same time PAGASA initiated bulletins on Tropical Depression
  Paeng.  Six hours later both JMA and PAGASA upgraded the system to
  tropical storm status with JMA assigning the international name Cimaron,
  which incidentally happens to be a name contributed by the Philippines.

  B. Synoptic History

     With a strong subtropical ridge to the north, Tropical Storm Cimaron
  embarked on a general west to west-northwesterly track which would lead
  to a rendezvous with the island of Luzon in 2 1/2 days.   By 27/1200 UTC
  Cimaron was located about 550 nm east of Manila and had intensified to
  50 kts.   With dual outflow channels developing, Cimaron began to deepen
  rapidly.  By 28/1200 UTC the MSW had increased to 100 kts; eighteen hours
  later Cimaron's winds had climbed to 155 kts--the most intense typhoon
  of 2006.  The estimated CP (per JMA's analysis) dropped 65 mb in 24 hours
  from 975 mb at 28/0600 UTC to 910 mb at 29/0600 UTC.  (See discussion
  on Cimaron's intensity in Section D below.)  The storm was a fairly
  compact typhoon with the gale radius being about 135 nm.  Super Typhoon
  Cimaron/Paeng was located about 175 nm northeast of Manila at 29/0600 UTC
  and closing in on the eastern coast of Luzon.   A TRMM overpass at
  29/0540 UTC revealed the presence of two tiny concentric eyewalls
  separated by only a few kilometres.

     The eye of the small but extremely intense typhoon made landfall just
  north of Casiguran around 1300 UTC on 29 October, still at its peak
  intensity of 155 kts.  Typhoon Paeng transited Luzon fairly quickly--by
  0000 UTC on the 30th the center had emerged off northeastern Luzon into
  the South China Sea.   A subtropical ridge to the north kept the typhoon
  on a general westerly track for a day or so, but a weakness developed
  in the ridge and Cimaron/Paeng began to turn to the northwest with a
  great reduction in its forward motion.  By 0600 UTC on 1 November Typhoon
  Cimaron had become essentially stationary about 230 nm south-southeast
  of Hong Kong.  After emerging from Luzon the MSW had become steady-state
  around 90 kts, but late on 31 October began to increase again, reaching
  a secondary peak intensity of 110 kts at 01/0600 UTC.  The rejuvenation,
  however, was short-lived.   As Cimaron sat basking in the sun over the
  South China Sea, it began to weaken under the combined unfavorable
  influences of increasing vertical shear, entrainment of dry air from the
  west, and suppressed equatorward outflow.

     The storm weakened quite rapidly from its 110-kt secondary peak at
  0600 UTC on 1 November.  At 1800 UTC on the 2nd both JMA and JTWC down-
  graded Cimaron to a 55-kt tropical storm, located about 280 nm south-
  southeast of Hong Kong.  The weakening cyclone was moving southwestward
  at 5 kts due to a north-northeasterly flow at the 850-700 mb level as
  strong ridging persisted over southern China.  JTWC downgraded Cimaron
  to a tropical depression at 1800 UTC on 3 November and issued their
  final warning at 04/1200 UTC with the system centered approximately
  390 nm south-southeast of Hong Kong, moving southwestward at 4 kts.
  Interestingly, JMA was still maintaining Cimaron as a minimal tropical
  storm at the time and continued to do so through 05/1800 UTC, downgrading
  it at 06/0000 UTC.  The system quickly weakened into a low-pressure area
  with the final reference in JMA's High Seas Bulletins placing it near
  11.0N/115.0E at 06/1800 UTC.   (Note:  The track map accompanying the
  online Wikipedia report on Cimaron depicts the residual LOW accelerating
  toward the southwest and moving into southern Vietnam and skimming along
  the southeastern Vietnamese coastline.   I did not save the JMA bulletins
  beyond 06/1800 UTC as the system was no longer being referred to as a
  tropical depression.)

  C. Damage and Casualties

     According to the online Wikipedia report, at least 19 people were
  killed in the northern Philippines, mostly by drowning.  An additional
  15 persons were reported missing.   Damage from Typhoon Paeng was
  estimated at around $9 million U. S. dollars.  In a coastal town near
  where the center made landfall, 90% of the houses were damaged.

  D. Additional Discussion

     The highest 10-min avg MSW estimated by both JMA and PAGASA for Super
  Typhoon Cimaron/Paeng was 105 kts.  The highest 1-min avg MSW reported
  in JTWC's warnings was 140 kts at 0600 and 1200 UTC on 29 October.  In
  the discussion above and also in the companion cyclone tracks file which
  I prepare, I have chosen to report 155 kts as the peak 1-min avg MSW
  for Cimaron.  Ever since I began writing the tropical cyclone summaries
  in 1997 I have rarely departed from using JTWC's warnings as the source
  of a 1-min avg MSW to report.  However, in the case of Cimaron, I felt
  that there was sufficient evidence that the cyclone was more intense than
  140 kts to warrant deviating from my long-standing practice.

     JTWC's intensity during the time under consideration was based solely
  on the Dvorak ratings by that agency's satellite analyst(s), which were
  T7.0/7.0.   However, AFWA rendered a rating of T7.5/7.5 at 0531, 1131,
  and 1431 UTC on the 29th, noting that constraints were broken due to
  the rapid intensification.  Also, the SAB analysis at 29/0833 UTC was
  T7.5/7.5.   The SAB rating at 29/0233 UTC had been T7.0/7.0, but the
  remarks indicate that the analyst felt very strongly that the system was
  more intense, but held back out of respect for the Dvorak rules.  He
  also noted that the visual Data-T number was T8.0.  In an e-mail, the
  same SAB analyst stated that he could not remember a storm with a 26 C
  eye being maintained for nearly 10 hours (and in GOES imagery at that!)
  while remaining embedded in a CMG (and at times CDG) ring without some
  breakdown.  Also, the JTWC satellite bulletins at 29/0230 and 29/0830
  UTC noted that the AODT numbers were 7.6 and 7.8, respectively.

     As a result of this, I requested Dr. Karl Hoarau (whom I regard as
  an expert Dvorak analyst), to study imagery of Cimaron and render his
  opinion.  Karl agreed with the SAB and AFWA analyses and estimated a
  peak intensity of 155 kts.

     This discussion should not be taken as a criticism of JTWC.  Indeed,
  the difference was only 1/2 T-number, and I have heard forecasters
  say "I'll never argue half a T-number with you."  And forecasters as a
  general rule tend to be more conservative as they are the ones who
  actually assign the reported intensity estimates.    It is really an
  academic issue--one would prepare for a 155-kt cyclone exactly as one
  would prepare for a 140-kt cyclone.

     However, just because it is an academic issue is not to say that it
  isn't important.  I personally feel that in post-storm analyses and "best
  track" intensity determinations, every effort should be made to fine tune
  the MSW to the very best 5-kt value.  The official "best track" databases
  are often the bases for climatological studies of tropical cyclones, and
  since the vast majority of the MSW values in the databases, globally
  speaking, are based on Dvorak analysis techniques (with perhaps nowadays
  microwave and scatterometer data playing an increasing role), it is very
  important that the analyses lying behind the estimated intensities be
  performed in as consistent manner as possible.  Otherwise, spurious
  trends could be inferred from the data, or conversely, real trends in 
  some parameter could be masked due to inconsistencies in the manner in
  which the intensities were determined.

  (Report written by Gary Padgett)


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

  Activity for October:  1 cyclonic storm **

  ** - no warnings issued on this system by JTWC

                           Sources of Information

     Most of the information presented below is based upon tropical
  cyclone warnings and significant tropical weather outlooks issued
  by the Joint Typhoon Warning Center of the U. S. Air Force and
  Navy (JTWC), located at Pearl Harbor, Hawaii.   Occasionally some
  information may be gleaned from the daily tropical weather outlooks
  and other bulletins issued by the Indian Meteorological Department
  (IMD), which is the World Meteorological Organization's Regional
  Specialised Meteorological Centre (RSMC) for the basin.
     The reported maximum sustained winds (MSW) are based on a 1-minute
  averaging period, which is used by all U. S. civilian and military
  weather services for tropical cyclone warnings.     For synoptic
  observations in the North Indian Ocean region, both 10-minute and
  3-minute average winds are employed, but IMD makes no attempt to
  modify the Dvorak scale for estimating tropical cyclone intensity;
  hence, a 1-minute average MSW is implied.  In the North Indian Ocean
  basin JTWC usually does not initiate warnings until a system has
  become well-organized and likely to attain tropical storm status
  within 48 hours.

                            CYCLONIC STORM OGNI
                              28 - 30 October

  Ogni: contributed by Bangladesh

     Cyclonic Storm Ogni formed in late October just off the southeastern
  coast of India and moved northward and inland, hugging the coastline all
  the way.  An area of convection developed on 27 October about 100 nm
  west of Colombo, Sri Lanka.  Satellite imagery revealed a LLCC developing
  in the Palk Strait with persistent convection.  An upper-level analysis
  indicated low to moderate vertical shear with good equatorward outflow
  and developing poleward outflow.  Satellite bulletins from JTWC and AFWA
  indicated that a tropical depression with winds of at least 25 kts likely
  had developed by 28/1130 UTC and was centered very near the coast of
  India about 75 nm south-southwest of Madras.  Environmental conditions
  in general were favorable for development--the only negative factor was
  the system's proximity to land.  At 28/2300 UTC JTWC upgraded the
  potential for development to 'fair', and at 0300 UTC on 29 October the
  IMD issued a bulletin classifying the developing system as a depression.

     The depression continued to move on an almost due northerly track just
  off the Indian coastline.  Satellite classifications from SAB indicate
  that winds had likely reached 30 kts by 29/0230 UTC and 35 kts six hours
  later.  IMD upgraded the system to deep depression status at 0900 UTC,
  and at 1200 UTC further upgraded it to Cyclonic Storm Ogni, located
  about 27 nm east of Kaveli.  A STWO issued by JTWC at 29/1100 UTC noted
  that the center was offshore with a band of deep convection wrapping
  into the northern quadrant from the east.  Maximum winds were estimated
  at 25-35 kts, but JTWC elected to not issue warnings on the system,
  although a TCFA was issued at 1130 UTC.

     Satellite classifications from SAB suggest that Ogni likely reached
  a peak intensity of 45 kts (1-min avg) around 29/1430 UTC, but had begun
  to slowly weaken by 0230 UTC on the 30th.  According to an IMD bulletin
  at 30/0300 UTC Ogni was centered very close to Ongole.  The storm
  continued to move northward and had moved inland south of Vijayavada
  by 0830 UTC, quickly weakening thereafter.  With the center nearing the
  coast, JTWC had cancelled the TCFA at 30/0230 UTC.   A radar image from
  an IMD website made at 30/0443 UTC depicts Ogni with the center almost
  on the Indian coastline and appears indicative of a system of tropical
  storm intensity.

     No damage or casualties are known to have resulted from Cyclonic
  Storm Ogni.

  (Report written by Gary Padgett)


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

  Activity for October:  1 tropical disturbance

                            Sources of Information

     The primary sources of tracking and intensity information for
  Southwest Indian Ocean tropical cyclones are the warnings issued by
  the Tropical Cyclone Warning Centre on La Reunion Island, part of
  Meteo France (MFR), and the Regional Specialised Meteorological Centre
  for the basin.    However, tropical cyclones in this region are named 
  by the Sub-regional Tropical Cyclone Advisory Centres in Mauritius and 
  Madagascar with longitude 55E being the demarcation line between their 
  respective areas of naming responsibility.  The La Reunion centre only 
  advises these agencies regarding the intensity of tropical systems.  
  References to sustained winds imply a 10-minute averaging period unless
  otherwise stated.

     In the companion tropical cyclone tracks file, I occasionally
  annotate positions from warnings issued by the Joint Typhoon Warning
  Center (JTWC) of the U. S. Air Force and Navy, located at Pearl
  Harbor, Hawaii, when they differ from MFR's coordinates by usually
  40-50 nm or more.  The JTWC warnings are also the source of the
  1-minute average maximum sustained wind values included in the
  tracks file.    Additionally, information describing details of
  satellite imagery and atmospheric circulation features included in
  the narratives is often gleaned from the JTWC warnings.

           Southwest Indian Ocean Tropical Activity for October

     The first tropical disturbance of the 2006-2007 season in the South-
  west Indian basin formed in mid-October.  Around 0000 UTC on 18 October
  a tight LLCC with flaring convection was located approximately 600 nm
  west-northwest of Diego Garcia.  JTWC issued the first of three TCFAs
  at 18/0900 UTC, noting that deep convection was increasing over a
  developing LLCC in the presence of vigorous poleward outflow and within
  a region of low to moderate vertical shear.  Winds were estimated to
  be 25-30 kts.  Over the next day the system drifted westward with
  little change.  MFR issued the first warning on Tropical Disturbance 01
  at 19/0600 UTC, locating the center somewhat to the north at a position
  approximately 250 nm east-northeast of the Seychelles.  JTWC issued a
  second TCFA at 0900 UTC, noting that the system was moving northwestward
  at 6 kts.   Interestingly, only four hours later JTWC issued a third
  TCFA for the disturbance.  As the system was very poorly-organized and
  located in a marginal environment for strengthening, MFR issued only
  very sporadic bulletins through the 21st, and JTWC cancelled their TCFA
  at 1300 UTC on 20 October, downgrading the potential for development to

     The system seemed to reform somewhat further to the south on the 21st.
  A bulletin issued by MFR at 21/0600 UTC placed the center approximately
  185 nm east-southeast of the Seychelles.  The southward movement
  continued with the system reaching a point about 125 nm northwest of
  Agalega at 22/1200 UTC.  At this point, MFR begin issuing regular
  6-hourly warnings on Tropical Disturbance 01, estimating the 10-min avg
  MSW at 25 kts.  No warnings were issued on the system by JTWC, but
  satellite bulletins from that agency and AFWA implied maximum 1-min avg
  winds of around 30 kts from the 18th through the 22nd.  The system
  began drifting westward on 22 October but began to slowly weaken.  The
  final MFR bulletin, issued at 23/1200 UTC, placed a weak 20-kt center
  approximately 185 nm north-northeast of the northern tip of Madagascar.
  A track for this system was included in the companion global cyclone
  tracks file prepared by the author.

     Short reports with satellite pictures and small-scale maps for all
  the Southern Hemisphere systems may be found at the following link:>



  Activity for October:  No tropical cyclones



  Activity for October:  No tropical cyclones


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

  Activity for October:  1 tropical depression
                         1 tropical cyclone of hurricane intensity

                           Sources of Information

     The primary sources of tracking and intensity information for
  South Pacific tropical cyclones are the warnings and advisories
  issued by the Tropical Cyclone Warning Centres at Nadi, Fiji (for
  waters north of latitude 25S), and Wellington, New Zealand (for
  waters south of latitude 25S).  References to sustained winds imply
  a 10-minute averaging period unless otherwise stated.

     In the companion tropical cyclone tracks file, I occasionally
  annotate positions from warnings issued by the Joint Typhoon Warning
  Center (JTWC) of the U. S. Air Force and Navy, located at Pearl
  Harbor, Hawaii, when they differ from the Southern Hemisphere
  centres' coordinates by usually 40-50 nm or more.  The JTWC warnings
  are also the source of the 1-minute average maximum sustained wind
  values included in the tracks file.    Additionally, information
  describing details of satellite imagery and atmospheric circulation
  features included in the narratives is often gleaned from the JTWC

                South Pacific Tropical Activity for October

     For the first time since 1997, a named tropical cyclone formed in
  South Pacific waters east of 160E during the month of October.  The
  cyclone, Xavier, not only was the first South Pacific October cyclone
  in nine years, but it also became an intense cyclone, peaking at 95 kts
  (10-min avg) per Fiji's analysis, or at 115 kts (1-min avg) per JTWC's
  analysis.  After reaching hurricane intensity, Tropical Cyclone Xavier
  passed over the island of Tikopia in the Santa Cruz group, which had
  been utterly devastated in late 2002 by the extremely intense Tropical
  Cyclone Zoe.   At one point Xavier's forecast track was southwestward
  toward the islands of the Republic of Vanuatu, but fortunately the
  storm shifted to a southeasterly track, relieving the threat to Vanuatu.
  A report on Tropical Cyclone Xavier, written by Simon Clarke, follows.

     During the time that Xavier was active, Nadi identified another system
  to the east as Tropical Depression 02F.  This system at 24/1800 UTC was
  located east of the Dateline approximately 300 nm northwest of American
  Samoa (12.0S/175.0W).  TD-02F moved westward, and at one point on the
  25th appeared to be increasing in organization, but as it moved across
  the Dateline it began to be unfavorably influenced by the outflow from
  Xavier.  TD-02F crossed the Dateline at a point approximately 325 nm
  north-northeast of Fiji (13.0S/180.0E), subsequently moving northwest-
  ward.  At 27/1800 UTC the weakening system was located about 350 nm west
  of Funafuti (8.5S/176.5E) and continued to drift westward until it was
  dropped from Fiji's tropical weather summaries on the 29th.    Nadi
  estimated that winds of 20-30 kts might be occurring up to 180 nm from
  the center, but no gale warnings were ever issued for TD-02F.  Since
  no satellite classifications warranting tropical depression status were
  issued on this system, no track was included in the companion global
  cyclone tracks file.

     Short reports with satellite pictures and small-scale maps for all
  the Southern Hemisphere systems may be found at the following link:>

                         TROPICAL CYCLONE XAVIER
                            (TD-01F / TC-01P)
                             20 � 28 October

  A. Storm Origins

     The South Pacific Cyclone Season was off to a very early start in the 
  form of TC Xavier which developed prior to the official commencement 
  of the cyclone season on 1 November.  The cyclone originated from a 
  persistent area of thunderstorm activity that was active in the 
  intertropical convergence zone stretching from the Solomon Islands 
  across to the north of Vanuatu for almost a week.

     By 20/2100 UTC, an area of consolidating convection near a LLCC was 
  identified near 9.9S/167.8E.  The LOW had a solid trade flow to the 
  south and was located in a region of superior upper outflow, 
  particularly to its north and east.  SSTs were around 29-30 deg C. 
  Development of the depression was rapid and by 22/0000 UTC, RSMC Nadi 
  upgraded the LOW to cyclone status and officially named the system 
  Xavier.  At this time the cyclone was located near 11.0S/167.8E, over 
  Santa Cruz, the eastern most group of islands in the Solomon chain.

  B. Synoptic History

     Initially Xavier meandered slowly to the east of the Utupua Island 
  before commencing what was to become a persistent track initially to 
  the SSE at 6 kts and finally to the SE at 10 kts.  Conditions 
  remained favorable for development, allowing the midget system to 
  intensify explosively.  Within 18 hours Xavier reached hurricane 
  intensity with a clear eye feature developing in a tightly-wrapped 
  central core.  The cyclone passed over Tikopia (pop. 1200), the 
  southernmost island in the Santa Cruz Group, famous for withstanding 
  Severe Tropical Cyclone Zoe in December, 2002 (see separate report).    

     Xavier continued to the SE at 10 kts in response to the northwesterly 
  steering flow. A change of path to the W or SW was forecast, but never 
  eventuated, which is counted as somewhat of a blessing as this track 
  would have taken Xavier through the main islands of Vanuatu.  Peak 
  intensity was attained at 24/0600 UTC near 13.7S/169.6E (approx. 220 nm 
  NE of Vila, Vanuatu, and 350 nm WNW of Nadi, Fiji).    Central 
  pressure was estimated to be 930 hPa with maximum 10 min-avg winds of 
  95kts.  Peak intensity was maintained for eighteen hours; thereafter 
  Xavier underwent an equally impressive weakening process losing 
  cyclone status at 26/0000 UTC as aggressive upper wind shear and 
  cooler sea surface temperatures eroded the system�s convective 
  structure, displacing it well to the SE of the LLCC.  At about 
  this time, Xavier�s path to the SE was blocked by a low-level south- 
  easterly surge from a solid mid-level ridge building to its south. 
  The remnant LLCC was forced back to the NNW at a rapid pace and 
  ultimately the LLCC lost identity a little over twenty four hours 

  (Note: The peak 1-min avg MSW estimated by JTWC for Tropical Cyclone
  Xavier was 115 kts at 24/0000 and 24/1200 UTC.)

  C. Damage and Casualties

     There were no casualties as a result of Xavier.  Minor tree damage 
  was reported from the islands of Utupua and Vanikolo.  Extensive 
  damage to food crops and flooding occurred at Tikopia.  However, 
  Radio New Zealand reported that overall damage at Tikopia was 
  considered to be light given the circumstances.  The cyclone side 
  swiped the eastern islands of Vanuatu, producing rough seas, beach 
  erosion and squally winds.  However, no significant damage was 

  (Report written by Simon Clarke)



     The purpose of this section is to list some websites where many and
  varied types of tropical cyclone information are archived.  Many readers
  will know about these already, but for the benefit of those who don't,
  I wanted to include them. 

  (1) Aircraft Reconnaissance Information

     Various types of messages from reconnaissance aircraft may be
  retrieved from the following FTP site:>

     Information regarding how to interpret the coded reconnaissance
  messages may be found at the following URL:>

  Links are also included to websites with further information about the
  U. S. Air Force 53rd Weather Reconnaissance Squadron and the NOAA Air-
  craft Operations Center.

  (2) Archived Advisories

     All the advisory products (public advisories, forecast/advisories,
  strike probabilities, discussions, various graphics) issued by TPC/NHC
  are archived on TPC's website.  For the current year (using 2004 as an
  example), the archived products can be found at:>

  Links to tropical products archives for earlier years are available at
  the following URL:>

  JTWC warnings for past storms are archived on the NRL Monterrey website:>

  On the NRL site, the link to past years can be found in the upper left 
  corner of the screen.

     I am not aware at the moment of any other TCWC which archives all
  its tropical cyclone warning/advisory products for public access, but
  if I learn of any, I will add them to this list.

  (3) Satellite Imagery

     Satellite images of tropical cyclones in various sensor bands are
  available on the NRL Monterrey and University of Wisconsin websites,
  courtesy of Jeff Hawkins and Chris Velden and their associates.  The
  links are:>>

  On the NRL site, the link to past years can be found in the upper left 
  corner of the screen.  For the CIMSS site, a link to data archives is 
  located in the lower left portion of the screen.

     Additional tropical satellite imagery, along with looping ability for
  composite microwave imagery for the Western Hemisphere north of the
  equator, can be found at:

  (1) For the Eastern North Pacific:>

  (2) For the Atlantic, Gulf of Mexico and Caribbean Sea:>

     I'm sure there are other sites with available imagery available, and
  as I learn of them, I will add the links to this list.


                               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 August, 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
  from the archive sites listed below.  (Note: I do have a limited e-mail
  distribution list for the track files.    If anyone wishes to receive
  these via e-mail, please send me a message.)

    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.   Back issues can be obtained from the following websites
  (courtesy of Michael Bath, Michael V. Padua, Michael Pitt, Chris
  Landsea, and John Diebolt):>>>>>

     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:>


     JTWC now has available on its website the Annual Tropical Cyclone
  Report (ATCR) for 2004 (2003-2004 season for the Southern Hemisphere).
  ATCRs for earlier years are available also.

     The URL is:>

     Also, TPC/NHC has available on its webpage nice "technicolor"
  tracking charts for the 2006 Atlantic and Eastern North Pacific
  tropical cyclones; also, storm reports for all the 2006 Atlantic
  and Eastern North Pacific cyclones are now available, as well as
  track charts and reports on storms from earlier years. 

     The URL is:>

     A special thanks to Michael Bath of McLeans Ridges, New South Wales,
  Australia, for assisting me with proofreading the summaries.


  Gary Padgett
  E-mail:  [email protected]
  Phone:  334-222-5327

  Kevin Boyle  (Northwest Pacific)
  E-mail:  [email protected]

  Simon Clarke  (Northeast Australia/Coral Sea, South Pacific)
  E-mail:  [email protected]


Document: summ0610.htm
Updated: 6th February 2007

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