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Monthly Global Tropical Cyclone Tracks April 2011
[Summaries and Track Data] [Prepared by Gary Padgett]

               GLOBAL TROPICAL CYCLONE TRACKS - APRIL 2011

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

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

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


                          Sources of Information
                          ----------------------

     The track coordinates, central pressure and 1-minute average
  maximum sustained wind values were obtained from the operational
  forecast/advisories issued by the Tropical Prediction Center/National
  Hurricane Center located in Miami, Florida.   A 1-minute averaging
  period is the standard used by all U. S. civilian and military
  warning services for tropical cyclone warnings.


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

   Possible Subtropical LOW (Invest 91L)               20 - 24 Apr

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

Storm Name: None                  Cyclone Number: None    Basin: ATL
(Identified aS NRL Invest 91L)

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

11 APR 20 0600  21.0 N   59.3 W  1012             NCEP reanalysis 
11 APR 20 1200  21.3 N   50.9 W  1014
11 APR 20 1800  21.4 N   62.0 W  1012   35        SAT=ST1.5 (NRL winds)
11 APR 21 0000  21.1 N   64.0 W  1012 
11 APR 21 0600  21.6 N   63.9 W  1011   35
11 APR 21 1200  21.8 N   63.4 W  1011   35
11 APR 21 1800  22.7 N   63.6 W  1012   35
11 APR 22 0000  24.5 N   62.7 W  1012   35
11 APR 22 0600  25.0 N   62.7 W  1010             SAT=ST1.5
11 APR 22 1200  25.3 N   62.9 W  1010   30        SAT=ST1.5
11 APR 22 1800  26.1 N   63.2 W  1010   35        SAT=ST1.5
11 APR 23 0000  25.0 N   63.2 W  1011 
11 APR 23 0600  24.9 N   64.7 W  1011
11 APR 23 1200  23.5 N   65.1 W  1012 
11 APR 23 1800  22.3 N   66.4 W  1013 
11 APR 24 0000  22.1 N   67.6 W  1013 
11 APR 24 0600  22.0 N   68.8 W  1014 
11 APR 24 1200  21.4 N   70.0 W                   Open wave
11 APR 24 1800  21.3 N   72.7 W        

Note: Although the NHC considered this an extratropical cyclone, the NOAA
Satellite and Information Service classified this as a subtropical
system of ST=1.5.  NRL also reorted winds of 35 kts.

Thanks to Steve Young for sending me the information on Invest 91L.
The above track was based on NCEP reanalysis data.  Following is the
track from NRL from 20-22 April:

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

11 APR 20 1800  23.2 N   60.8 W         35
11 APR 21 0600  23.3 N   62.5 W         35
11 APR 21 1200  23.6 N   62.9 W         35
11 APR 21 1800  24.4 N   63.0 W         35
11 APR 22 0000  25.3 N   63.0 W         35
11 APR 22 1200  26.9 N   62.9 W         30   
11 APR 22 1800  26.5 N   64.0 W         35 

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

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


                          Sources of Information
                          ----------------------

     The track coordinates and 1-minute average maximum sustained wind
  values in general were taken from operational warnings issued by the
  Joint Typhoon Warning Center (JTWC) of the U. S. Air Force and Navy,
  located at Pearl Harbor, Hawaii.  The central pressure and 10-minute
  average maximum sustained wind estimates for most systems were obtained
  from warnings issued by the Japanese Meteorological Agency (JMA), which
  is the World Meteorological Organization's Regional Specialised Meteor-
  ological Centre for the basin.  In a few instances, information from
  warnings issued by other Asian warning centers may have been utilized.
  The center position coordinates from JMA and other centers were com-
  pared with those from JTWC and annotations made in the Remarks column
  when the differences in general amounted to 40-50 nm or more.

     Michael V. Padua of Naga City in the Philippines, owner of the
  Typhoon 2000 website, sends me cyclone tracks based upon warnings
  issued by the Japanese Meteorological Agency and the Philippines'
  Atmospheric, Geophysical & Astronomical Services Administration
  (PAGASA).  A special thanks to Michael for his efforts.

     Following is the link to the Wikipedia page for the 2011 Pacific
  Typhoon Season:
  
  http://en.wikipedia.org/wiki/2011_Pacific_typhoon_season>

     Following are links to Michael Padua's storm logs for the April
  tropical systems:
   
  http://www.typhoon2000.ph/stormarchives/2011/stormlogs/outsidePAR/01W11_log.htm>

  http://www.typhoon2000.ph/stormarchives/2011/stormlogs/01amang11_log.htm>


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

   Tropical Depression (01W)                           31 Mar - 04 Apr
   Tropical Depression (02W / AMANG)                   03 - 07 Apr  
    
*************************************************************************

Storm Name: None                  Cyclone Number: 01W     Basin: NWP
PAGASA Internal Name: None        JMA Tropical Storm Number: None

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

11 MAR 31 1800   9.0 N  112.0 E  1008         20  Low pressure area
11 APR 01 0000   9.0 N  112.0 E  1004         25  JMA bulletins
11 APR 01 0600   9.0 N  111.0 E  1004         25
11 APR 01 1200   9.0 N  112.0 E  1004         25
11 APR 01 1800   9.0 N  111.0 E  1004         25
11 APR 02 0000   9.3 N  111.3 E  1006   25    30  JMA: 8.7N/111.3E
11 APR 02 0600   9.3 N  111.2 E  1004   25    30
11 APR 02 1200   9.2 N  111.1 E  1004   25    30  JMA: 9.5N/111.7E
11 APR 02 1800   9.5 N  111.6 E  1006   30    30
11 APR 03 0000   9.3 N  111.8 E  1006   30    30
11 APR 03 0600   9.1 N  111.7 E  1004   25    30  JMA: 9.1N/111.7E
11 APR 03 1200   9.0 N  112.4 E  1004         30  JMA bulletins
11 APR 03 1800   9.0 N  113.0 E  1006         25
11 APR 04 0000   8.0 N  113.0 E  1008         25
11 APR 04 0600   8.0 N  114.0 E  1008         25

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

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

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

11 APR 03 0000  11.0 N  130.0 E  1004         20  Low pressure
11 APR 03 0600   9.6 N  131.7 E  1002         30  JMA bulletins
11 APR 03 1200  10.1 N  132.2 E  1002         30
11 APR 03 1800  11.0 N  132.8 E  1000         30
11 APR 04 0000  11.6 N  133.4 E  1002         30
11 APR 04 0600  12.6 N  134.5 E  1002         30
11 APR 04 1200  12.9 N  135.8 E  1002         30
11 APR 04 1800  13.8 N  137.1 E  1002         30
11 APR 05 0000  15.4 N  139.1 E  1002    30   30  JTWC Warnings
11 APR 05 0600  16.1 N  141.1 E  1002    30   30
11 APR 05 1200  16.5 N  143.0 E  1002    30   25  Becoming XT
11 APR 05 1800  17.0 N  145.0 E  1002    30   25  JMA: 16.0N/144.0E
11 APR 06 0000  17.6 N  146.8 E  1004    25   25  JMA: 17.0N/147.0E
11 APR 06 0600  17.0 N  148.0 E  1004         25  JMA bulletins
11 APR 06 1200  17.0 N  149.0 E  1004         25
11 APR 06 1800  18.0 N  151.0 E  1004             Extratropical
11 APR 07 0000  19.0 N  152.0 E  1008

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

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


                          Sources of Information
                          ----------------------

     The track coordinates as well as the central pressure and 10-minute
  average maximum sustained wind estimates were obtained from warnings
  issued by Meteo France's Tropical Cyclone Warning Centre on Reunion
  Island (MFR), which is the World Meteorological Organization's Regional
  Specialised Meteorological Centre for the basin.  The 1-minute average
  maximum sustained wind estimates were taken from warnings issued by the
  Joint Typhoon Warning Center (JTWC) of the U. S. Air Force and Navy,
  located at Pearl Harbor, Hawaii.  The center position coordinates from
  JTWC were compared with those from MFR and annotations made in the
  Remarks column when the differences in general amounted to 40-50 nm
  or more.

     Following is the link to the Wikipedia page for the 2010-2011
  Southwest Indian Ocean Cyclone Season:

  http://en.wikipedia.org/wiki/2010%E2%80%9311_South-West_Indian_Ocean_cyclone_season>


                             Systems Tracked
                             ---------------
         
   Subtropical Depression (MFR-09)                     12 - 17 Apr

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

Storm Name: None                  Cyclone Number: None    Basin: SWI
MFR Tropical Disturbance Number: 09    (NRL Invest 94S)

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

11 APR 12 0000  24.9 S   50.3 E  1007             NRL pressures
11 APR 12 0600  25.0 S   50.2 E  1007 
11 APR 12 1200  24.8 S   50.2 E  1006 
11 APR 12 1800  25.2 S   50.1 E  1007 
11 APR 13 0000  25.1 S   49.9 E  1007 
11 APR 13 0600  25.6 S   50.0 E  1007
11 APR 13 1200  27.9 S   48.6 E  1001         40  Initial MFR warning
11 APR 13 1800  28.6 S   48.7 E  1000         40
11 APR 14 0000  29.1 S   48.3 E   999         40
11 APR 14 0600  29.6 S   47.7 E   999         40
11 APR 14 1200  30.5 S   47.7 E   998         40
11 APR 14 1800  31.5 S   47.4 E   999         40
11 APR 15 0000  32.2 S   47.0 E   995         40
11 APR 15 0600  32.8 S   47.3 E   987         50
11 APR 15 1200  33.8 S   47.5 E   985         50
11 APR 15 1800  34.8 S   48.4 E   986         50
11 APR 16 0000  35.7 S   49.0 E   992         45  Locally 50 kts NW quad
11 APR 16 0600  37.0 S   49.6 E   995         35  Locally 45 kts E semi.
11 APR 16 1200  39.8 S   50.8 E  1002             NCEP re-analysis
11 APR 16 1800  40.3 S   52.6 E  1005
11 APR 17 0000  43.1 S   56.7 E  1007
11 APR 17 0600  45.1 S   62.6 E  1007

Note: The pre and post-warning portions of the above track were sent to
the author by Steve Young.  Following is a short write-up of this system
by Steve:

"On April 9 a diffuse area of low pressure moved from Mozambique into the
Indian Ocean.  By the 12th a circulation formed north of the initial 
system and was quasi-stationary near 25S/50E.  Designated Investigative 
Area 94S, the system drifted southeastward.  Although the NRL considered
this a weak system (15 kts, 1010 mb), reanalysis data indicated a
stronger system with central pressure of 997 mb or less.  Following 
extratropical transisition, the system continued to track southeastward,
being absorbed into a frontal system on April 17.  At one time, there 
were indications that this was a subtropical depression (ST=2.0) with 
winds of 25-30 kts."

It should be noted that SAB rendered Hebert/Poteat ratings as high as
ST 3.0 on 15 April.

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

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


                          Sources of Information
                          ----------------------

     The track coordinates as well as the central pressure and 10-minute
  average maximum sustained wind estimates were obtained from warnings
  issued by the Tropical Cyclone Warning Centres at Perth, Western
  Australia, and Darwin, Northern Territory.    The 1-minute average
  maximum sustained wind estimates were taken from warnings issued by
  the Joint Typhoon Warning Center (JTWC) of the U. S. Air Force and
  Navy, located at Pearl Harbor, Hawaii.  The center position coordinates
  from JTWC were compared with those from the Australian centres and
  annotations made in the Remarks column when the differences in general
  amounted to 40-50 nm or more.

     Following is the link to the Wikipedia page for the 2010-2011
  Australian Region Cyclone Season:

  http://en.wikipedia.org/wiki/2010%E2%80%9311_Australian_region_cyclone_season>


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

   Tropical Cyclone ERROL (29U / 21S)                  14 - 18 Apr

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

Storm Name: ERROL                 Cyclone Number: 21S     Basin: AUW
(Name assigned by Darwin TCWC - Australian LOW 29U)

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

11 APR 14 0600  12.0 S  126.0 E  1000         30
11 APR 14 1200  12.5 S  126.3 E  1000         25
11 APR 14 1800  12.4 S  126.4 E  1000         30
11 APR 15 0000  12.7 S  126.1 E   996   40    35  Named TC Errol
11 APR 15 0600  12.5 S  125.8 E   996         40
11 APR 15 1200  12.6 S  126.0 E   996   45    40
11 APR 15 1800  12.2 S  125.4 E   997         40
11 APR 16 0000  11.7 S  125.1 E   989   50    50
11 APR 16 0600  11.3 S  124.7 E   986   50    55
11 APR 16 1200  11.0 S  124.7 E   986   55    55  JTWC: 11.5S/124.5E
11 APR 16 1800  11.1 S  124.4 E   991   50    50
11 APR 17 0000  10.9 S  124.1 E   993   45    45  Jakarta warnings
11 APR 17 0600  11.0 S  124.0 E   999         40
11 APR 17 1200  11.0 S  123.2 E  1001   40    35  JTWC: 10.1S/125.1E
11 APR 17 1800  10.6 S  123.6 E  1001         35
11 APR 18 0000  10.2 S  123.5 E  1003   35    30  Ex-TC
11 APR 18 1200   9.9 S  123.1 E         30

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

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


                        Sources of Information
                        ----------------------

     The track coordinates as well as the central pressure and 10-minute
  average maximum sustained wind estimates were obtained from warnings
  issued by the Tropical Cyclone Warning Centres at Nadi, Fiji, and
  Wellington, New Zealand.  The 1-minute average maximum sustained wind
  estimates were taken from warnings issued by the Joint Typhoon Warning
  Center (JTWC) of the U. S. Air Force and Navy, located at Pearl Harbor,
  Hawaii.  The center position coordinates from JTWC were compared with
  those from the Southern Hemisphere centres and annotations made in the
  Remarks column when the differences in general amounted to 40-50 nm
  or more.

     Following is the link to the Wikipedia page for the 2010-2011
  South Pacific Cyclone Season:

  http://en.wikipedia.org/wiki/2010%E2%80%9311_South_Pacific_cyclone_season>


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

   Tropical Depression (14F)                           09 - 11 Apr
   Tropical Depression (15F)                           15 - 16 Apr

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

Storm Name: None                  Cyclone Number: None    Basin: SPA
Fiji Tropical Disturbance Number: 14F

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

11 APR 09 2100  19.0 S  171.0 E  1007
11 APR 10 0600  17.3 S  170.0 E  1005
11 APR 10 1800  19.5 S  171.0 E  1005
11 APR 10 2100  20.6 S  172.7 E  1005
11 APR 11 0000  21.2 S  172.8 E  1005
11 APR 11 0600  21.6 S  173.6 E  1005
11 APR 11 1800  23.4 S  175.6 E  1008
11 APR 11 2100  23.9 S  175.6 E  1008

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

Storm Name: None                  Cyclone Number: None    Basin: SPA
Fiji Tropical Disturbance Number: 15F

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

11 APR 15 1800  20.7 S  159.6 E  1003
11 APR 15 2100  22.4 S  160.9 E
11 APR 16 0000  23.0 S  160.6 E  1000         30
11 APR 16 0600  23.4 S  161.9 E  1000         35  Gales NE quad
11 APR 16 1200  23.8 S  163.0 E  1000         30
11 APR 16 1800  24.7 S  164.6 E   999         30
11 APR 16 2100  25.0 S  165.9 E  1000         30

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

                   ********** SPECIAL NOTE **********

     I now have some assistants who are helping to prepare the monthly
  tropical cyclone files, and I'd like to thank them for their willing-
  ness to assist me.  Kevin Boyle, of Stoke-on-Trent, UK, will be 
  preparing the tracks for Northwest Pacific basin tropical cyclones 
  during the most active part of the NWP season from June through 
  December. 

     Michael Bath, of McLeans Ridges, New South Wales, Australia, is now
  preparing the track files for Australian Region and South Pacific
  tropical cyclones.  Also, Steve Young sends me tracks with data for 
  the pre-warning and post-warning stages of tropical cyclones in all 
  basins, prepared primarily from NCEP re-analysis data or else taken
  from NRL files.

     A very special thanks is due to Kevin, Michael and Steve for their
  assistance.

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

                   SOURCES OF TROPICAL CYCLONE INFORMATION

     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:

     ftp://ftp.nhc.noaa.gov/pub/products/nhc/recon/>

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

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

  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:

     http://www.nhc.noaa.gov/archive/2004/index.shtml>

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

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

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

     http://www.nrlmry.navy.mil/tc_pages/tc_home.html>

  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:

     http://www.nrlmry.navy.mil/tc_pages/tc_home.html>

     http://cimss.ssec.wisc.edu/tropic/tropic.html>

  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:

     http://www.ssd.noaa.gov/PS/TROP/trop-epac.html>

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

     http://www.ssd.noaa.gov/PS/TROP/trop-atl.html>

  (4) Cyclone Tracking Information
  --------------------------------

     There is a U. S. Navy site that tracks tropical cyclones at 6-hourly
  intervals which often includes pre and post-advisory positions.  The
  link to the site is:

  http://www.nrlmry.navy.mil/atcf_web/doc_archives/>

     Steve Young has compiled many of these tracks onto a single webpage
  which is very user-friendly:

  http://home.earthlink.net/~shy9/tc1.htm>

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

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

     To repeat the caveat which is included in the Author's Note
  at the end of the cyclone summaries--the tropical cyclone tracks
  I prepare are based upon the operational warnings/advisories/
  advices/bulletins which are issued by 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 which include that agency's "best
  tracks" for tropical cyclones in the Northwest Pacific basin, the
  North Indian Ocean, and the Southern Hemisphere:

     http://www.usno.navy.mil/JTWC>


  SPECIAL NOTE:  Back issues of the global tropical cyclone summaries
  and monthly cyclone track files can be obtained at the following
  websites:

    ftp://ftp.aoml.noaa.gov/hrd/pub/landsea/padgett/>
    http://australiasevereweather.com/cyclones/>
    http://www.typhoon2000.ph>
    http://mpittweather.com>


  PREPARED BY:

  Gary Padgett              garyp@alaweb.com
  Kevin Boyle               michaelpace@btinternet.com
  Michael Bath              mbath@ozemail.com.au


  SIGNIFICANT CONTRIBUTIONS BY:

  Michael V. Padua          michaelpadua@hotmail.com 
                            webmaster@typhoon2000.ph
  Steve Young               shy9@earthlink.net

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

Document: trak1104.htm
Updated: 14 June 2011

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