#65 Postby cycloneye » Wed Dec 09, 2009 8:08 am
ZCZC 537
WTIO30 FMEE 091216
RSMC / TROPICAL CYCLONE CENTRE / LA REUNION
TROPICAL CYCLONE TECHNICAL BULLETIN (SOUTH-WEST INDIAN OCEAN)
0.A WARNING NUMBER : 15/6/20092010
1.A SEVERE TROPICAL STORM 6 (CLEO)
2.A POSITION 2009/12/09 AT 1200 UTC :
WITHIN 20 NM RADIUS OF POINT 12.2S / 72.7E
(TWELVE DECIMAL TWO DEGREES SOUTH AND SEVENTY TWO DECIMAL SEVEN
DEGREES
EAST)
MOVEMENT : WEST-SOUTH-WEST 8 KT
3.A DVORAK ANALYSIS : 3.5/4.0 /W 1.0/12 H
4.A CENTRAL PRESSURE : 980 HPA
5.A MAX AVERAGE WIND SPEED (10 MN) : 60 KT
RADIUS OF MAXIMUM WINDS (RMW) : 25 KM
6.A EXTENSION OF WINDS BY QUADRANTS (KM):
30 KT NE: 100 SE: 220 SO: 260 NO: 090
50 KT NE: 030 SE: 030 SO: 030 NO: 030
7.A FIRST CLOSED ISOBARE (PRESSURE / AVERAGE DIAM): 1009 HPA / 650 KM
8.A VERTICAL EXTENSION OF CYCLONE CIRCULATION: DEEP
1.B FORECASTS:
12H: 2009/12/10 00 UTC: 13.1S/71.2E, MAX WIND=050KT, SEVERE TROP.
STORM.
24H: 2009/12/10 12 UTC: 14.0S/69.5E, MAX WIND=045KT, MODERATE TROP.
STORM
.
36H: 2009/12/11 00 UTC: 14.5S/67.9E, MAX WIND=040KT, MODERATE TROP.
STORM
.
48H: 2009/12/11 12 UTC: 14.9S/66.3E, MAX WIND=035KT, MODERATE TROP.
STORM
.
60H: 2009/12/12 00 UTC: 15.3S/64.8E, MAX WIND=030KT, TROP.
DEPRESSION.
72H: 2009/12/12 12 UTC: 15.6S/63.9E, MAX WIND=025KT, TROP.
DISTURBANCE.
2.B OTHER INFORMATIONS:
T=3.5 CI=4.0+
CLEO IS MAINTAINING AN EMBEDDED CENTER PATTERN SINCE LAST NIGHT, WITH
A
DECREASING CDO, DESPITE OF A GOOD UPPER LEVEL DIVERGENCE. SSMIS OF
02:30Z
. MW IMAGERY ALSO CONFIRMS THAT INTERNAL STRUCTURE OF SYSTEM HAS
STRONGLY
DETERIORATED, AND THE VAPOR DATA SHOW DRY AIR IN THE WEST OF THE
SYSTEME
WHICH IN
VASION SHOULD PRECIPITATE THE WEAKENING OF THE SYSTEM.
UPPER LEVEL CONSTRAINT IS EXPECTED TO BE PERSISTANT OR INTENSIFYING
AS
THE SYSTEM REMAINS ON THE WESTERN EDGE OF THE UPPER LEVEL RIDGE.
MOREOVER
, SYSTEM IS CURRENTLY MOVING OVER LESS OCEANIC CONTENT WATER.
CONSEQUENTLY, A WEAKENING TREND IS INDICATED FOR THE WHOLE FORECAST
PERIOD. DUE TO ITS SMALL S
IZE, THE WEAKENING TREND COULD BE FASTER THAN ESTIMATED IN THIS
FORECAST.
THE SYSTEM TRACKS WESTSOUTHWESTWARDS ON THE NORTHWESTERN EDGE OF A
SUBTROPICAL RIDGE LOCATED IN THE SOUTHEAST. AVAILABLE NWP REMAIN IN
GOOD
AGREEMENT FOR THE NEXT 24 HOURS BUT SHOW SOME DISAGREEMENT
THEREAFTER.
UKMET HAS THE NORTHERN MOST TRACK WITH A QUASI-WESTWARDS, ON THE
OTHER
HAND SOME GUIDANCE
, AS NGP, A MORE SOUTHWESTWARDS TRACK.
THE PRESENT FORECAST IS BASED ON A CONSENSUS OF ALL AVAILABLE
GUIDANCE,
SLOWNING DOWN AT THE END OF THE PERIOD AS THE SUBTROPICAL RIDGE
DECREASE
DUE TO AN APPROCHING TROUGH.=
NNNN
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