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02.62.92.11.47
RSMC / TROPICAL CYCLONE CENTRE / LA REUNION
TROPICAL CYCLONE FORECAST WARNING (SOUTH-WEST INDIAN OCEAN)
0.A WARNING NUMBER : 31/4/20072008
1.A TROPICAL DISTURBANCE 4 (EX-CELINA)
2.A POSITION 2007/12/20 AT 0000 UTC :
22.6S / 56.5E
(TWENTY TWO DECIMAL SIX DEGREES SOUTH AND FIFTY SIX DECIMAL FIVE DEGREES EAST)
3.A DVORAK ANALYSIS : 2.0/2.0 /S
4.A CENTRAL PRESSURE : 999 HPA
5.A MAX AVERAGE WIND SPEED (10 MN) : 25 KT
6.A EXTENSION OF WINDS BY QUADRANTS (KM):
7.A FIRST CLOSED ISOBARE (PRESSURE / AVERAGE DIAM): 1008 HPA / 800 KM
8.A VERTICAL EXTENSION OF CYCLONE CIRCULATION: SHALLOW
1.B FORECASTS:
12H: 2007/12/20 12 UTC: 22.6S/55.0E, MAX WIND=025KT, TROP. DISTURBANCE.
24H: 2007/12/21 00 UTC: 22.3S/53.6E, MAX WIND=025KT, TROP. DISTURBANCE.
36H: 2007/12/21 12 UTC: 22.2S/52.5E, MAX WIND=020KT, TROP. DISTURBANCE.
48H: 2007/12/22 00 UTC: 22.8S/51.5E, MAX WIND=020KT, FILLING UP.
60H: 2007/12/22 12 UTC: 23.4S/51.1E, MAX WIND=020KT, FILLING UP.
72H: 2007/12/23 00 UTC: 24.0S/50.9E, MAX WIND=020KT, FILLING UP.
2.B OTHER INFORMATIONS:
T=CI=2.0.
THE LLCC IS TOTALLY EXPOSED WITH A POOR CONVECTIVE ACTIVITY.
HIGH PRESURE REBUILT TO THE SOUTHWEST AND SHOULD MAKE THE RESIDUAL VORTEX CURVE WESTNORTHWESTWARDS, BEFORE TRACKING SOUTHWESTWARDS, TURNING AROUND HIGH PRESSURES.
THE PRESENCE OF A SMALL UPPER LEVEL TROUGH EXPLAINS THE WEAKENING OF THE VERTICAL WINDSHEAR, BUT ALSO A POOR UPPER LEVEL DICERGENCE.