Direction Interrégionale de LA REUNION
B.P.4    97491 Ste Clotilde Cedex
Téléphone                02.62.92.11.00
Fax exploitation      02.62.92.11.48
Fax direction           02.62.92.11.47

RSMC / TROPICAL CYCLONE CENTRE / LA REUNION TROPICAL CYCLONE FORECAST WARNING (SOUTH-WEST INDIAN OCEAN) 0.A WARNING NUMBER : 29/12/20082009 1.A EXTRATROPICAL DEPRESSION 12 (EX-JADE) 2.A POSITION 2009/04/11 AT 0600 UTC : 29.2S / 56.9E (TWENTY NINE DECIMAL TWO DEGREES SOUTH AND FIFTY SIX DECIMAL NINE DEGREES EAST) MOVEMENT : SOUTH-EAST 21 KT 3.A DVORAK ANALYSIS : / 4.A CENTRAL PRESSURE : 985 HPA 5.A MAX AVERAGE WIND SPEED (10 MN) : 50 KT RADIUS OF MAXIMUM WINDS (RMW) : 40 KM 6.A EXTENSION OF WINDS BY QUADRANTS (KM): 30 KT NE: 300 SE: 450 SO: 150 NO: 200 50 KT NE: 040 SE: 040 SO: 030 NO: 020 7.A FIRST CLOSED ISOBARE (PRESSURE / AVERAGE DIAM): 1008 HPA 8.A VERTICAL EXTENSION OF CYCLONE CIRCULATION: MEDIUM 1.B FORECASTS: 12H: 2009/04/11 18 UTC: 33.9S/57.9E, MAX WIND=050KT, EXTRATROPICAL. 24H: 2009/04/12 06 UTC: 36.0S/59.4E, MAX WIND=050KT, EXTRATROPICAL. 36H: 2009/04/12 18 UTC: 42.7S/63.8E, MAX WIND=050KT, EXTRATROPICAL. 48H: 2009/04/13 06 UTC: 49.3S/67.7E, MAX WIND=055KT, EXTRATROPICAL. 60H: 2009/04/13 18 UTC: 57.2S/75.8E, MAX WIND=055KT, EXTRATROPICAL. 2.B OTHER INFORMATIONS: THE EXTRATOPICAL TRANSITION IS VISIBLE ON THE LAST QUIKSCAT DATA 03Z AND PRESSION DATA OF THE BUOY NR 53597 AS THE CENTER PASS NEARBY BETWEEN 22 AN 23Z. THE SYSTEM IS EXPECTED TO TEMPORALY SLOW DOWN DURING THE NEXT 24 HOURS, THEN ACCELERATE AGAIN TOWARDS THE EXTRATROPICAL LATITUDES. STRONGEST WINDS EXTEND IN THE EASTERN SECTOR DUE TO THE SYSTEM OWN MOTION AND THE GRADIENT EFFECT WIT THE SUBTROPICAL HIGH PRESSURES. THE LOW IS EXPECTED TO DISSIPATE BEYOND TAU 60 MERGING IN A POLAR TROUGH.