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