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Monthly Global Tropical Cyclone Tracks April 2001
[Summaries and Track Data] [Prepared by Gary Padgett]

               GLOBAL TROPICAL CYCLONE TRACKS - APRIL 2001


          !!!! IMPORTANT -- PLEASE SEE NOTE AT END OF FILE !!!!

*************************************************************************

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

NOTE:  The following track was supplied by David Roth, a meteorologist
       employed at the Hydrometeorological Prediction Center.  Just a
       few days ago, the author received a visible satellite image of
       a well-developed occuded cyclone in the Atlantic on 8 April, sent 
       by John Wallace of San Antonio, Texas.      I have forwarded this 
       image to David Roth and asked for his opinion on whether it could
       be considered a hybrid or subtropical cyclone.   If David feels
       that it does qualify and provides a track, I will include it with
       the cyclone tracks file for May.


                              Systems Tracked
                              ---------------

   Hybrid/Possible Subtropical LOW                     25 - 28 Apr

*************************************************************************

Storm Name: None                  Cyclone Number: None    Basin: ATL
(Hybrid or possible subtropical system--track by David Roth)

   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 25 0000  33.0 N   38.0 W  1014   15
01 APR 25 0600  33.0 N   40.0 W  1009   20
01 APR 25 1200  32.0 N   40.0 W  1011   20
01 APR 25 1800  31.0 N   39.0 W  1011   20
01 APR 26 0000  30.9 N   38.1 W  1012   15
01 APR 26 0600  30.8 N   37.4 W  1012   25
01 APR 26 1200  30.4 N   36.8 W  1013   25
01 APR 26 1800  29.9 N   36.4 W  1014   35
01 APR 27 0000  29.0 N   37.0 W  1014   25
01 APR 27 0600  29.1 N   38.2 W  1015   25
01 APR 27 1200  30.0 N   39.0 W  1016   20
01 APR 27 1800  30.0 N   40.0 W  1017   25
01 APR 28 0000  29.1 N   40.8 W  1018   15
01 APR 28 0600  28.4 N   41.9 W  1019   15
01 APR 28 1200  27.8 N   43.1 W  1020   10
01 APR 28 1800  27.3 N   44.6 W  1020   10

Note:  System formed along a dying stationary front, then drifted
aimlessly to the southeast until late on the 26th, when the surface
steering around the surface ridge finally moved it southwestward.
The tracking information is based on MPC maps with emphasis on ship
observations.  The only ship to report 35-kt winds (at 26/1800 UTC)
was situated in the tightest gradient between the LOW and an adjacent
HIGH.  Many 25-kt ship reports were received on the 26th and 27th.

*************************************************************************
*************************************************************************

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

NOTE:  The tracking information for Northwest Pacific Basin tropical
       cyclones is based primarily upon operational warnings from the
       Joint Typhoon Warning Center of the U.S. Air Force and Navy at
       Pearl Harbor, Hawaii. Comparisons were made with track coordinates
       given in advisories from the meteorological services of Japan
       (JMA) and the Philippines (PAGASA).  In general, whenever the
       center position differed by more than 40-50 nm from JTWC's, an
       entry was made in the Remarks column.

       The 1-min avg MSW were taken from the JTWC advisories while the
       10-min avg MSW were obtained from PAGASA's advisories.  Apparently
       JMA did not issue any bulletins on the following system; hence,
       there are no central pressure estimates.

       Michael V. Padua, owner of the Typhoon 2001 webpage, sent me the 
       PAGASA track for this system--a special thanks to Michael for his
       assistance.


                             Systems Tracked
                             ---------------

   Tropical Depression (02W / BAROK)                   18 - 19 Apr

*************************************************************************

Storm Name: None                  Cyclone Number: 02W     Basin: NWP
PAGASA Internal Name: BAROK       JMA Tropical Storm Number: None

   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 18 0600   7.5 N  132.0 E               25  PAGASA Warning
01 APR 18 1200   8.7 N  129.5 E         25    25  PAGASA: 9.0 N, 130.5 E
01 APR 18 1800   8.8 N  131.7 E         25    25  Relocated 
01 APR 19 0000   9.6 N  131.0 E         20    25  PAGASA: 9.2 N, 130.0 E
01 APR 19 0600  10.0 N  130.0 E               25  PAGASA Warning

*************************************************************************
*************************************************************************

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

NOTE:  The tracking and intensity information for the following system
       was supplied by Roger Edson of the University of Guam, formerly
       a forecaster with JTWC.  No warnings were issued on this system
       by either JTWC or IMD, although JTWC mentioned the disturbance
       for several days in their Tropical Weather Outlooks and issued
       a Tropical Cyclone Formation Alert for the system.  The cyclone
       actually started in the Gulf of Thailand (NWP basin) and tracked
       across the Malay Peninsula into the Andaman Sea.  Since it spent
       the majority of its life and reached its peak intensity in the
       eastern Bay of Bengal, I am including it here as a North Indian
       Ocean system.


                               Systems Tracked
                               ---------------

   Tropical Cyclone "PI"                               28 Apr - 03 May

*************************************************************************

Storm Name: "PI"                  Cyclone Number: None    Basin: NWP/NIO
(Track provided by Roger Edson)

   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 28 1200   4.0 N  105.0 E         15
01 APR 29 0000   6.5 N  104.0 E         20
01 APR 29 1200   8.5 N  102.5 E         30
01 APR 30 0000  11.0 N  100.0 E         35
01 APR 30 1200  11.5 N   99.0 E  1006   25        Overland
01 MAY 01 0000  11.5 N   97.0 E  1005   30
01 MAY 01 1200  12.2 N   96.0 E  1004   35
01 MAY 02 0000  12.8 N   95.5 E         40
01 MAY 02 1200  14.0 N   96.0 E  1003   40        JTWC issued TCFA
01 MAY 02 1800  14.5 N   96.5 E  1003   30
01 MAY 03 0000  15.2 N   97.2 E  1003   25
01 MAY 03 0600  16.0 N   98.0 E         20        Overland

Note:  The central pressure estimates were taken from STWOs and the
Tropical Cyclone Formation Alert (TCFA) issued by JTWC.

*************************************************************************
*************************************************************************

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

NOTE:  The tracking coordinates, 10-min avg MSW, and estimates of
       central pressure were obtained from the RSMC La Reunion's
       (MFR) advisories, while the 1-min avg MSW values were taken
       from JTWC's warnings.  A very special thanks to Patrick Hoareau
       of Rennes, France, for sending me the tracks for these systems
       already typed in the correct format with only minimal editing
       needed by myself.


                             Systems Tracked
                             ---------------

   Tropical Storm EVARISTE (MFR 09 / 18S)              01 - 08 Apr
   Tropical Depression (MFR 10 / 16S)                  02 - 05 Apr

*************************************************************************

Storm Name: EVARISTE              Cyclone Number: 18S     Basin: SWI
MFR Tropical Disturbance Number: 09

   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 01 0130   9.0 S   65.0 E  1008         20  Based on QuikScat pass
01 APR 02 1200   9.2 S   61.9 E  1002         25  
01 APR 03 0000   9.8 S   61.6 E  1002   30    25  See Note
01 APR 03 0600  10.2 S   61.9 E  1002         25
01 APR 03 1200  10.4 S   62.2 E  1002         25
01 APR 03 1800  10.3 S   62.2 E  1000   30    25
01 APR 04 0000  10.4 S   62.2 E   997         30
01 APR 04 0600  12.0 S   63.7 E   998   35    30
01 APR 04 1200  12.8 S   63.4 E   998         30
01 APR 04 1800  13.7 S   62.8 E   997   45    30  JTWC: 12.9 S, 62.4 E
01 APR 05 0000  13.2 S   62.5 E   991         40
01 APR 05 0600  13.6 S   61.4 E   991   60    40
01 APR 05 1200  14.4 S   61.4 E   980         55
01 APR 05 1800  15.0 S   61.2 E   977   75    60
01 APR 06 0000  15.7 S   61.0 E   977         60
01 APR 06 0600  16.3 S   61.0 E   976   75    60
01 APR 06 1200  16.8 S   60.8 E   978         55
01 APR 06 1800  17.8 S   60.9 E   980   65    50  JTWC: 17.3 N, 60.7 E
01 APR 07 0000  18.6 S   61.0 E   980         50
01 APR 07 0600  20.4 S   62.0 E   984   55    50  JTWC: 21.2 S, 62.4 E
01 APR 07 1200  23.2 S   62.0 E   988   45    45
01 APR 07 1800  23.2 S   61.0 E   992   40    40  JTWC: 23.1 S, 60.4 E
01 APR 08 0000  23.3 S   60.7 E   998   40    30
01 APR 08 0600  24.3 S   61.8 E         35        JTWC Warning

Note:  Winds locally reaching 30 kts.

*************************************************************************

Storm Name: None                  Cyclone Number: 16S     Basin: SWI
MFR Tropical Disturbance Number: 10

   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 02 1800  13.3 S   86.6 E         35        JTWC Wrng - See Note #1
01 APR 03 0600  14.5 S   84.2 E  1002   35    25  JTWC: 13.7 S, 84.2 E
01 APR 03 1200  15.0 S   83.1 E   997         30  See Note #2
01 APR 03 1800  15.5 S   81.9 E   997   35    30       "
01 APR 04 0000  16.0 S   81.2 E   998         30       
01 APR 04 0600  15.4 S   79.6 E   998   35    30 
01 APR 04 1200  15.0 S   78.5 E   999         25  See Note #3  
01 APR 04 1800  15.1 S   77.6 E   999   35    25       "
01 APR 05 0000  14.1 S   76.7 E  1000         25       "
01 APR 05 0600  13.0 S   77.0 E         35        JTWC Warning
01 APR 05 1800  11.3 S   77.9 E         25             "

Note #1:  At 02/1800 UTC Perth issued a satellite classification bulletin
for the benefit of WMO Region 1 countries, assigning a Dvorak rating of
T4.0 to this system with peak 10-min mean winds estimated at 55 kts.  The
first JTWC warning noted that the tropical cyclone was extremely compact
and that the Dvorak classification could possibly be unrepresentative of
the true strength of the system.

Note #2:  Winds locally reaching 35 kts in southern semicircle.

Note #3:  Winds locally reaching 30 kts in southern semicircle.

*************************************************************************
*************************************************************************

NORTHWEST AUSTRALIA/SOUTHEAST INDIAN OCEAN (AUW) - Longitude 90E to 135E

NOTE:  The tracking information presented below was obtained from
       operational warnings issued by the Tropical Cyclone Warning
       Centres at Perth, Western Australia, and Darwin, Northern
       Territory.  Also, the central pressure estimates and 10-min avg 
       MSW values were obtained from Perth's and Darwin's warnings while
       the 1-min avg MSW was taken from JTWC warnings.  A special thanks 
       to Patrick Hoareau for sending me the tracks for these systems
       already typed in the correct format.


                             Systems Tracked
                             ---------------

   Severe Tropical Cyclone WALTER (17S)                01 - 08 Apr
   Tropical Cyclone ALISTAIR (20S)                     16 - 22 Apr

*************************************************************************

Storm Name: WALTER                Cyclone Number: 17S     Basin: AUW


   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 01 0400  10.8 S  110.8 E  1007         25      
01 APR 01 1000  10.7 S  110.1 E  1007         25
01 APR 01 2200  10.5 S  110.5 E  1007         25
01 APR 02 0400  10.0 S  108.0 E   995         45
01 APR 02 1000  09.9 S  106.8 E   995         45
01 APR 02 1600  09.6 S  106.1 E   995   25    45 
01 APR 02 2200  09.8 S  105.2 E   990   35    45  JTWC-00Z: 10.1S, 103.9E
01 APR 03 0400  09.7 S  103.8 E   985         50
01 APR 03 1000  09.9 S  102.5 E   985   55    50
01 APR 03 1600  10.0 S  101.8 E   980         55
01 APR 03 2200  10.1 S  101.0 E   960         65 
01 APR 04 0100  10.1 S  100.6 E   960   65    65
01 APR 04 0400  10.3 S  100.0 E   960         65
01 APR 04 1000  10.5 S   98.7 E   960   75    65
01 APR 04 1600  10.7 S   98.2 E   950         80 
01 APR 04 2200  11.3 S   97.0 E   955   90    80
01 APR 05 0400  11.7 S   96.6 E   975         60
01 APR 05 1000  12.1 S   96.1 E   975   80    60
01 APR 05 1600  12.6 S   95.6 E   975         60
01 APR 05 2200  12.8 S   95.4 E   970   70    65
01 APR 06 0400  13.2 S   95.2 E   970         65
01 APR 06 1000  13.7 S   94.8 E   970   65    65
01 APR 06 1600  14.2 S   94.2 E   970         65
01 APR 06 2200  15.0 S   94.0 E   970   65    65  JTWC-00Z: 15.1S, 95.0E
01 APR 07 0400  16.4 S   95.0 E   970         65
01 APR 07 1000  16.5 S   95.7 E   980   50    55  JTWC-12Z: 17.9S, 95.2E
01 APR 07 1600  18.3 S   95.4 E   980         55
01 APR 07 2200  19.8 S   96.8 E   985   45    45  JTWC-00Z: 19.3S, 95.3E
01 APR 08 0400  20.6 S   94.7 E   995         40
01 APR 08 1000  21.0 S   94.8 E   998   30    30  JTWC-12Z: 22.7S, 94.7E
                                              
*************************************************************************

Storm Name: ALISTAIR              Cyclone Number: 20S     Basin: AUW


   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 16 0000  08.3 S  135.7 E  1004   25        JTWC Formation Alert
01 APR 16 0600  08.0 S  134.5 E  1002   30    30  JTWC: 7.0 S, 134.3 E
01 APR 16 1200  10.0 S  134.0 E  1000         30      
01 APR 16 1800  10.2 S  132.8 E   990   35    40  JTWC: 9.3 S, 132.9 E
01 APR 17 0000  10.4 S  131.4 E   990         40
01 APR 17 0600  10.8 S  130.5 E   990   35    40 
01 APR 17 1200  11.6 S  129.5 E   990         40    
01 APR 17 1800  11.8 S  128.6 E   990   40    40 
01 APR 18 0000  12.7 S  127.0 E   985   45    50 
01 APR 18 0600  13.8 S  125.3 E   985   55    50  JTWC: 13.5 S, 125.7 E
01 APR 18 1000  14.3 S  124.5 E   980   60    55  Entered Perth AOR
01 APR 18 1600  14.9 S  123.3 E   975   60    60
01 APR 18 2200  15.5 S  122.4 E   975   65    60
01 APR 19 0400  16.4 S  121.1 E   975   65    60
01 APR 19 1000  17.2 S  120.0 E   975   60    60 
01 APR 19 1600  17.8 S  118.9 E   980   55    55 
01 APR 19 2200  17.8 S  116.5 E   985   50    50
01 APR 20 0400  18.1 S  115.3 E   990   45    50
01 APR 20 1000  18.6 S  113.9 E   990   45    50
01 APR 20 1600  19.0 S  112.7 E   990   40    50
01 APR 20 2200  19.9 S  112.0 E   990   40    50
01 APR 21 0400  20.4 S  111.1 E   990   35    45
01 APR 21 1000  20.9 S  111.4 E   990   35    45  JTWC-12Z: 21.1S, 110.0E
01 APR 21 1600  21.1 S  109.8 E   995         40
01 APR 21 2200  21.6 S  109.3 E  1000         35
01 APR 22 1800  23.5 S  109.5 E  1005   25        JTWC Trop WX Outlook

*************************************************************************
*************************************************************************

NORTHEAST AUSTRALIA/CORAL SEA (AUE) - Longitude 135E to 160E

NOTE:  The tracking information presented below was obtained from
       operational warnings issued by the Tropical Cyclone Warning
       Centre at Darwin, Northern Territory.  Also, the central pressure 
       estimates and 10-min avg MSW values were obtained from Darwin's 
       warnings.  


                             Systems Tracked
                             ---------------

   Tropical LOW                                        04 - 05 Apr
     
*************************************************************************

Storm Name: None                  Cyclone Number: None    Basin: AUE
(Tropical LOW in the western Gulf of Carpentaria)

   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 04 0130  11.0 S  137.0 E  1004         30  Darwin Advices
01 APR 04 0730  11.5 S  136.5 E  1004         30
01 APR 04 1330  11.5 S  136.3 E  1005         30
01 APR 04 1930  11.7 S  135.8 E  1005         30
01 APR 05 0130  11.8 S  135.4 E  1005         30
01 APR 05 0530  12.2 S  134.8 E  1006         25  Moving Inland

*************************************************************************
*************************************************************************

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

NOTE:  The tracking and intensity information for South Pacific
       Basin tropical cyclones was taken from real-time operational
       warnings issued by the Nadi TCWC, Fiji for positions north of
       25S and from the Wellington, New Zealand office for positions
       south of 25S.  Warnings from JTWC were utilized for the purpose
       of making comparisons and for supplying information for times
       when the Nadi or Wellington warnings were unavailable.   The
       10-min avg MSW values were taken from the Fiji or New Zealand
       warnings while the 1-min avg MSW values were obtained from the
       JTWC warnings.


                             Systems Tracked
                             ---------------

   Tropical Cyclone SOSE (13F / 19P)                   04 - 11 Apr

*************************************************************************

Storm Name: SOSE                  Cyclone Number: 19P     Basin: SPA
Fiji Tropical Disturbance Number: 13F

   Date   Time   Lat      Lon    Cent  MSW   MSW        Remarks
          (GMT)                 Press 1-min 10-min
                                 (mb) (kts) (kts)
-------------------------------------------------------------------------

01 APR 04 2100  13.5 S  170.0 E  1000         25
01 APR 05 0000  14.5 S  167.5 E  1000         25
01 APR 05 0600  14.5 S  166.5 E   999         25
01 APR 05 1200  14.2 S  165.5 E   999         25
01 APR 05 1800  14.0 S  165.8 E   995   35    35
01 APR 06 0000  14.0 S  165.2 E   992         40
01 APR 06 0600  14.0 S  165.2 E   987   40    45
01 APR 06 1200  14.2 S  165.0 E   987         45
01 APR 06 1800  14.4 S  165.5 E   985   50    50  Relocated
01 APR 07 0000  14.6 S  165.7 E   985         50
01 APR 07 0600  15.6 S  166.3 E   980   65    55  JTWC: 15.7 S, 166.8 E
01 APR 07 1200  16.8 S  166.7 E   980         55
01 APR 07 1800  17.9 S  167.2 E   980   70    55  JTWC: 17.8 S, 167.7 E
01 APR 08 0000  18.7 S  167.9 E   975         60
01 APR 08 0600  19.7 S  168.1 E   975   60    60
01 APR 08 1200  20.4 S  169.3 E   975         60
01 APR 08 1800  20.5 S  169.5 E   980   55    55
01 APR 09 0000  21.1 S  170.5 E   985         50
01 APR 09 0600  21.8 S  170.5 E   985   50    50
01 APR 09 1200  22.8 S  170.5 E   985         50
01 APR 09 1800  23.2 S  170.1 E   985   50    50
01 APR 10 0000  23.9 S  169.9 E   987         45
01 APR 10 0600  24.4 S  169.7 E   987   40    45
01 APR 10 1200  25.0 S  169.6 E   990         40
01 APR 10 1800  25.5 S  169.7 E   988   35    45  Wellington Warnings
01 APR 11 0000  26.0 S  170.0 E   990         45
01 APR 11 0600  26.5 S  169.5 E   992   30    45  Extratropical
01 APR 11 1200  26.6 S  169.4 E   992         35

*************************************************************************
*************************************************************************

             !!!!!!  IMPORTANT NOTE - PLEASE READ  !!!!!!

     It has been brought to my attention that I should repeat in the
  cyclone tracks file the caveat which is included in the Author's
  Note at the end of the cyclone summaries.   The tropical cyclone
  tracks which I prepare are based upon the operational warnings/
  advisories/advices/bulletins from the various tropical cyclone
  warning agencies around the world.   Users of these tracks should
  be aware that they are preliminary and subject to revision during
  post-seasonal analyses of the cyclones by the forecasters and
  analysts at the several warning centers.

     For the Atlantic and Northeast Pacific basins, official tropical
  cyclone reports and "best tracks" can be found at the website of
  the Tropical Prediction Center/National Hurricane Center:

     http://www.nhc.noaa.gov>

     The Joint Typhoon Warning Center's website contains links to their
  Annual Tropical Cyclone Reports (ATCR) which include that agency's 
  "best tracks" for tropical cyclones in the Northwest Pacific basin, 
  the North Indian Ocean, and the Southern Hemisphere:

     http://199.10.200.33/jtwc.html>

     For the actual Best Tracks files, click on the link for Best Tracks
  (in the menu on the left side of the screen) and follow instructions.

     In the ATCR for 2000, the Chapter 5 tab contains verification
  statistics of JTWC warnings for all the 2000 tropical cyclones in the
  Northwest Pacific, North Indian Ocean, and the Southern Hemisphere.
  There are gaps in the Best Tracks presented here for certain cyclones
  during periods in which no warnings were being issued.

*************************************************************************
*************************************************************************
*************************************************************************

Document: trak0104.htm
Updated: 29th December 2006

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