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Southern Hemisphere 1999-2000 Tropical Cyclone Season Review
[Summaries and Track Data] [Prepared by Gary Padgett]

             A REVIEW OF THE 1999-2000 TROPICAL CYCLONE SEASON

                       FOR THE SOUTHERN HEMISPHERE

     Following is a tabular summary of all the tropical depressions
  and tropical cyclones which occurred in the Southern Hemisphere
  between 1 July 1999 and 30 June 2000 as reported in the Monthly
  Global Tropical Cyclone Summaries prepared by the author.

    (1) Number - this is the cyclone warning number assigned by JTWC
                 in Hawaii (or NPMOC for systems in the South Pacific
                 east of longitude 180).

    (2) Name - the name (if any) assigned by the responsible Tropical
               Cyclone Warning Centre.  For systems in the South Indian
               west of 90E and in the Southwest Pacific east of 160E
               which were unnamed, the alphanumeric designator applied
               by La Reunion or Fiji, respectively, is given in this
               column.

    (3) Dates - range of dates for which tracking information for the 
                cyclone is available in the Global Tropical Cyclone
                Tracks documents prepared by the author.  The dates
                given in most cases refer to the time the system was
                in warning status and generally do not include the
                pre-depression stages of the disturbance.

    (4) Pressure - Lowest central pressure (either estimated or recorded)
                   during the lifetime of the cyclone. An asterisk (*) 
                   following the pressure indicates the reading was an
                   actual measured pressure.   Central pressure is given
                   in millibars, which is numerically equivalent to
                   hectopascals.

    (5) MSW 1-min avg- maximum 1-minute average sustained windspeed in 
                       knots as assigned by JTWC or NPMOC.  An asterisk
                       (*) following the MSW indicates that it was an
                       actual measured value.

    (6) MSW 10-min avg - maximum 10-minute average sustained windspeed
                         in knots as assigned by the responsible Tropical
                         Cyclone Warning Centre.     An asterisk (*)
                         following the MSW indicates that it was an
                         actual measured value.

    (7) Basins - tropical cyclone basins where the cyclone tracked during
                 its life:

        SWI - Southwest Indian Ocean - West of 90E
        AUW - Northwest Australia/Southeast Indian Ocean - 90E to 135E
        AUE - Northeast Australia/Coral Sea - 135E to 160E
        SPA - South Pacific Ocean - East of 160E

     A number in parentheses (e.g. (1) ) following an entry refers to
  a note following the entries for the given basin.   A separate table
  is given for each of the four Southern Hemisphere basins.

  NOTE: It will be noted that the basins as defined above are different
  from what I have been using.  An explanation of this change and the
  rationale behind it will be forthcoming in the June tropical cyclone
  summary.

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

                          SOUTHWEST INDIAN OCEAN

 JTWC    NAME                DATES          CENT    MSW   MSW    BASIN
 NUM                                        PRS   1-MIN 10-MIN
                                            (mb)   (kts) (kts)
 ------------------------------------------------------------------------

 03S  ASTRIDE               24 Dec-03 Jan    985     65    50     SWI
 04S  BABIOLA               03-12 Jan        954     90    80     SWI
 ---  03 (Reunion)          12-26 Jan        998     25    25     SWI
 08S  CONNIE                25 Jan-02 Feb    928    115   100     SWI
 10S  DAMIENNE              31 Jan-02 Feb    992     45    40     SWI
 12S  FELICIA               19-24 Feb        974     50    60     SWI
 15S  GLORIA                28 Feb-05 Mar    988     65    45     SWI
 17S  09 (Reunion)          01-07 Mar        998     30    30     SWI
 ---  10 (Reunion)          02-03 Mar       1002     --    25     SWI
 21S  HUDAH                 24 Mar-09 Apr    905    125   120     AUW/SWI
 ---  13 (Reunion)          11-14 Apr       1000     30    40     SWI (1)
 26S  INNOCENTE             12-19 Apr        994     45    35     SWI

 NOTES:

 (1) This system was treated as a subtropical cyclone by La Reunion.
     Roger Edson of the University of Guam provided me with an alternate
     track of this system.  In Roger's opinion the system was a purely
     tropical system, even though convection was somewhat shallow, and
     attained a maximum 1-min avg MSW of 70 kts.
 
 ************************************************************************

               NORTHWEST AUSTRALIA / SOUTHEAST INDIAN OCEAN

 JTWC    NAME                DATES          CENT    MSW   MSW    BASIN
 NUM                                        PRS   1-MIN 10-MIN
                                            (mb)   (kts) (kts)
 ------------------------------------------------------------------------

 01S  ILSA                  10-17 Dec        985     60    55     AUW
 02S  JOHN                  09-16 Dec        915    130   110     AUW
 06S  -----                 18-23 Jan        992     35    30     AUW
 09S  KIRRILY               25 Jan-01 Feb    965     80    65     AUW
 11S  LEON-ELINE            03-23 Feb        928    115   100     AUW/SWI
 ---  MARCIA                15-21 Feb        992     30    45     AUW
 16S  NORMAN                28 Feb-08 Mar    920    120   110     AUW
 20S  OLGA                  15-21 Mar        980     45    55     AUW
 24S  PAUL                  13-22 Apr        920    125   110     AUW
 27S  ROSITA                15-21 Apr        930    125   105     AUW

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

                     NORTHEAST AUSTRALIA / CORAL SEA

 JTWC    NAME                DATES          CENT    MSW   MSW    BASIN
 NUM                                        PRS   1-MIN 10-MIN
                                            (mb)   (kts) (kts)
 ------------------------------------------------------------------------

 ---  -----                 02-03 Dec       1002     --    35     AUE (1)
 ---  -----                 26-29 Dec        992     --    45     AUE (2)
 ---  -----                 10-11 Jan       1000     --    35     AUE (1)
 ---  -----                 12-13 Jan       1002     --    40     AUE (3)
 ---  -----                 19 Feb          1003     --    25     AUE
 14P  STEVE                 25 Feb-12 Mar    975     65    62*(5) AUE/AUW
 ---  -----                 14-16 Mar       1002     --    40     AUE (1)
 ---  -----                 24-26 Mar       1006     --    40     AUE (4)
 22P  TESSI                 31 Mar-02 Apr    987     45    59*(6) AUE
 23P  VAUGHAN               28 Mar-07 Apr    975     55    60     SPA/AUE
 ---  21F (Fiji)            26 Apr-02 May   1000     --    40 (7) AUE/SPA
 ---  20F (Fiji)            28 Apr-02 May    996     --    50 (7) AUE/SPA
 ---  24F (Fiji)            20-23 May       1002     --    40 (8) SPA/AUE

 NOTES:

 (1) In WMO Region V (Australia and the South Pacific), the definition
     of a tropical cyclone requires that the center be surrounded by
     gales.  This stipulation was added in order to weed out some
     poorly organized tropical depressions which might have (usually)
     peripheral gales in one or two quadrants only due to a tight
     pressure gradient with a nearby anticyclone.     Therefore,
     occasionally a system will be carried as a tropical depression
     (or tropical LOW) but for which the maximum winds are exceeding
     gale force.

 (2) This system formed overland and moved into the Coral Sea.  It was
     never referred to as a tropical LOW in Brisbane warnings and likely
     was of a hybrid nature.

 (3) LOW actually formed just east of 160E.  A higher-latitude system
     which was likely more baroclinic or hybrid in nature.

 (4) System was not a true tropical LOW, being more of a hybrid in
     nature.

 (5) A maximum 10-min wind of 62 kts was recorded at Green Island near
     Cairns, Queensland.

 (6) A maximum 10-min wind of 59 kts was recorded at the Magnetic Island
     AWS near Townsville, Queensland.

 (7) Both of these systems began in the Brisbane AOR but wandered east-
     ward across 160E where they were assigned numbers by Nadi, Fiji.
     In both cases the gale-force winds were occurring in the southern
     semicircle only due to an exceptionally tight pressure gradient
     with a HIGH to the south.  Dvorak numbers did not exceed T2.0 for
     either depression.

 (8) System formed just east of 160E where it was assigned a number by
     Nadi.  Gales were in the southern semicircle only due to a tight
     pressure gradient with a HIGH to the south.  Dvorak numbers did not
     exceed T1.5 for this depression.

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

                          SOUTH PACIFIC OCEAN

 JTWC    NAME                DATES          CENT    MSW   MSW    BASIN
 NUM                                        PRS   1-MIN 10-MIN
                                            (mb)   (kts) (kts)
 ------------------------------------------------------------------------

 ---  -----                 05-06 Sep       1000     --    35     SPA (1)
 ---  -----                 01-02 Nov       1000     --    35     SPA (2)
 ---  -----                 13-14 Nov        995     --    40     SPA (3)
 ---  03F (Fiji)            01-03 Dec       1006     --    30     SPA
 ---  04F (Fiji)            05-07 Dec       1003     --    35     SPA (1)
 ---  06F (Fiji)            03-06 Jan       1004     --    25     SPA
 05P  IRIS                  07-10 Jan        975     65    60     SPA (4)
 ---  08F (Fiji)            20-26 Jan        996     ---   40     SPA (1)
 07P  JO                    23-28 Jan        975     65    60     SPA
 13P  KIM                   23-29 Feb        955    100    80     SPA
 ---  13F (Fiji)            28-29 Feb        994     --    35     SPA (1)
 18P  LEO                   05-09 Mar        985     60    50     SPA
 19P  MONA                  07-13 Mar        965     80    70     SPA
 25P  NEIL                  15-17 Apr        992     40    40     SPA
 ---  22F (Fiji)            03-08 May       1004     --    40     SPA (1)

 NOTES:

 (1) In WMO Region V (Australia and the South Pacific), the definition
     of a tropical cyclone requires that the center be surrounded by
     gales.  This stipulation was added in order to weed out some
     poorly organized tropical depressions which might have (usually)
     peripheral gales in one or two quadrants only due to a tight
     pressure gradient with a nearby anticyclone.     Therefore,
     occasionally a system will be carried as a tropical depression
     (or tropical LOW) but for which the maximum winds are exceeding
     gale force.

 (2) This system and the first one in September were likely more hybrid
     than purely tropical in nature.

 (3) This system was never referred to as a tropical depression and was
     likely more of a hybrid or even baroclinic depression.

 (4) Iris was a small midget cyclone which very quickly intensified
     and then quickly weakened.  At one point the objective (digital)
     Dvorak T-number reached 6.5 (127 kts), and a Satellite Bulletin
     from JTWC mentioned that while the T-number derived from visible
     imagery was 4.0 (65 kts), the IR-derived T-number was 6.0 (115 kts).

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

 Prepared by Gary Padgett
 E-mail: [email protected]
 Home Phone: 334-222-5327
 Work Phone: 850-882-2594

Document: summ1999-2000.htm
Updated: 4th January 2007

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