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发表于 2025-1-10 04:50
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WTIO30 FMEE 091942
RSMC / TROPICAL CYCLONE CENTER / LA REUNION
TROPICAL CYCLONE FORECAST WARNING (SOUTH-WEST INDIAN OCEAN)
0.A WARNING NUMBER: 12/5/20242025
1.A MODERATE TROPICAL STORM 5 (DIKELEDI)
2.A POSITION 2025/01/09 AT 1800 UTC:
WITHIN 30 NM RADIUS OF POINT 14.2 S / 60.5 E
(FOURTEEN DECIMAL TWO DEGREES SOUTH AND
SIXTY DECIMAL FIVE DEGREES EAST)
MOVEMENT: WEST 16 KT
3.A DVORAK ANALYSIS: 3.5/3.5/D 0.5/6 H
4.A CENTRAL PRESSURE: 996 HPA
5.A MAX AVERAGE WIND SPEED (10 MN): 45 KT
RADIUS OF MAXIMUM WINDS (RMW): NIL
6.A EXTENSION OF WIND BY QUADRANTS (KM):
28 KT NE: 95 SE: 240 SW: 285 NW: 65
34 KT NE: 65 SE: 110 SW: 65 NW: 65
48 KT NE: 0 SE: 0 SW: 0 NW: 0
64 KT NE: 0 SE: 0 SW: 0 NW: 0
7.A FIRST CLOSED ISOBAR (PRESSURE / AVERAGE DIAM): 1008 HPA / 400 KM
8.A VERTICAL EXTENSION OF CYCLONE CIRCULATION: DEEP
1.B FORECASTS (WINDS RADII IN KM):
12H: 2025/01/10 06 UTC: 14.0 S / 57.4 E, VENT MAX= 065 KT, TROPICAL
CYCLONE
28 KT NE: 95 SE: 215 SW: 230 NW: 95
34 KT NE: 65 SE: 120 SW: 95 NW: 65
48 KT NE: 45 SE: 65 SW: 45 NW: 45
64 KT NE: 35 SE: 45 SW: 35 NW: 35
24H: 2025/01/10 18 UTC: 13.6 S / 54.3 E, VENT MAX= 080 KT, TROPICAL
CYCLONE
28 KT NE: 100 SE: 240 SW: 250 NW: 100
34 KT NE: 75 SE: 140 SW: 100 NW: 75
48 KT NE: 55 SE: 65 SW: 45 NW: 45
64 KT NE: 35 SE: 45 SW: 35 NW: 35
36H: 2025/01/11 06 UTC: 12.8 S / 51.7 E, VENT MAX= 085 KT, TROPICAL
CYCLONE
28 KT NE: 110 SE: 215 SW: 240 NW: 120
34 KT NE: 85 SE: 120 SW: 110 NW: 95
48 KT NE: 55 SE: 65 SW: 45 NW: 55
64 KT NE: 35 SE: 45 SW: 35 NW: 45
48H: 2025/01/11 18 UTC: 12.9 S / 49.8 E, VENT MAX= 065 KT, TROPICAL
CYCLONE
28 KT NE: 155 SE: 155 SW: 175 NW: 110
34 KT NE: 100 SE: 85 SW: 65 NW: 85
48 KT NE: 55 SE: 65 SW: 45 NW: 45
64 KT NE: 45 SE: 35 SW: 35 NW: 35
60H: 2025/01/12 06 UTC: 13.8 S / 46.5 E, VENT MAX= 050 KT, SEVERE
TROPICAL STORM
28 KT NE: 95 SE: 205 SW: 120 NW: 0
34 KT NE: 65 SE: 65 SW: 75 NW: 0
48 KT NE: 45 SE: 45 SW: 0 NW: 0
72H: 2025/01/12 18 UTC: 14.7 S / 43.9 E, VENT MAX= 060 KT, SEVERE
TROPICAL STORM
28 KT NE: 110 SE: 205 SW: 120 NW: 0
34 KT NE: 75 SE: 65 SW: 75 NW: 0
48 KT NE: 45 SE: 45 SW: 0 NW: 0
2.B LONGER-RANGE OUTLOOK:
96H: 2025/01/13 18 UTC: 16.8 S / 41.4 E, VENT MAX= 065 KT, TROPICAL
CYCLONE
28 KT NE: 100 SE: 205 SW: 155 NW: 85
34 KT NE: 75 SE: 65 SW: 55 NW: 55
48 KT NE: 55 SE: 45 SW: 35 NW: 35
64 KT NE: 35 SE: 35 SW: 30 NW: 30
120H: 2025/01/14 18 UTC: 20.8 S / 40.1 E, VENT MAX= 070 KT, TROPICAL
CYCLONE
28 KT NE: 215 SE: 130 SW: 205 NW: 140
34 KT NE: 110 SE: 75 SW: 85 NW: 100
48 KT NE: 70 SE: 60 SW: 60 NW: 60
64 KT NE: 50 SE: 40 SW: 50 NW: 40
2.C ADDITIONAL INFORMATION:
T=CI=3.5-
OVER THE PAST 6 HOURS, CONVECTION HAS REMAINED INTENSE, WITH NUMEROUS
THUNDERSTORM IMPACTS. SINCE 17UTC, THE CLOUD STRUCTURE HAS COOLED
OVERALL, BECOMING MORE CURVED, INDICATING AN INTENSIFICATION OF THE
SYSTEM. IN THE ABSENCE OF RECENT MICROWAVE DATA, IT IS DIFFICULT TO
JUDGE THE EXACT POSITION OF THE LOW-LEVEL CENTER, BUT ANALYSIS OF
CONVENTIONAL SATELLITE IMAGERY NEVERTHELESS ALLOWS US TO ESTIMATE IT
AT THE SOUTHEASTERN EDGE OF THE MAIN CONVECTIVE MASS. GIVEN THE
IMPROVED CLOUD STRUCTURE AND FAVORABLE ENVIRONMENTAL CONTEXT,
DIKELEDI'S INTENSITY HAS BEEN RAISED TO 45KT. THIS IS CONFIRMED BY
SUBJECTIVE DVORAK ANALYSIS.
IN TERMS OF TRACK, GUIDANCE IS STILL A LITTLE TOO FAR SOUTH FOR OUR
ANALYSIS. OVER THE NEXT 36 HOURS, DIKELEDI WILL CONTINUE TO HEAD
WEST-NORTH-WEST AT A GOOD PACE ALONG THE NORTHERN EDGE OF A
SUBTROPICAL RIDGE. THE MODELS REMAIN IN FAIRLY GOOD AGREEMENT
REGARDING A LATE-DAY OR EVENING LANDING ON MADAGASCAR ON SATURDAY.
HOWEVER, THERE ARE STILL A FEW ALONG TRACKS AMONG SOME OF THE
GUIDANCE SYSTEMS. UNCERTAINTY ABOUT THE TRACK INCREASES FROM 60H
ONWARDS, WITH A HIGH DEGREE OF DISPERSION BETWEEN MODELS. THE
MAJORITY SCENARIO SUGGESTS AN EXIT INTO THE MOZAMBIQUE CHANNEL ON
SUNDAY, WITH THE TRACK CURVING WEST-SOUTH-WEST THEN SOUTH-WEST, DUE
TO A MORE OR LESS MARKED WEAKNESS IN THE WESTERN EDGE OF THE RIDGE
SOUTH OF MADAGASCAR. THE RSMC FORECAST IS BASED ON A COMPROMISE
BETWEEN THE VARIOUS GUIDELINES, AND IS CURRENTLY FOLLOWING THE AIFS
GUIDANCE PROPOSING A GOOD CONSENSUS OF THE PRESENT FORECAST.
IN TERMS OF INTENSITY, ENVIRONMENTAL CONDITIONS ARE GRADUALLY
IMPROVING THIS THURSDAY EVENING AND UNTIL FRIDAY EVENING, WITH A
RELATIVE INFLUENCE OF EASTERLY SHEAR DUE TO THE SYSTEM'S WESTWARD
MOVEMENT. DIKELEDI IS ALSO BENEFITING FROM STRONG ALTITUDE
DIVERGENCE, AS SHOWN BY THE LATEST SATELLITE IMAGES. THESE FAVORABLE
ENVIRONMENTAL CONDITIONS WILL FAVOR A BETTER SYMMETRIZATION OF THE
SYSTEM OVER THE NEXT 48 HOURS. THE SMALL SIZE OF THE SYSTEM COULD
EVEN ACCENTUATE THE RISK OF RAPID INTENSIFICATION OVER THE NEXT 24 TO
36 HOURS. IN THIS CONTEXT, THE TROPICAL CYCLONE STAGE IS FORECAST
FROM FRIDAY UNTIL LANDFALL OVER MADAGASCAR ON SATURDAY. A STRONGER
INTENSIFICATION IS NOT COMPLETELY EXCLUDED, BUT WILL POTENTIALLY
DEPEND ON FLUCTUATIONS IN THE SYSTEM'S INTERNAL PHYSICS (EYE
REPLACEMENT CYCLE) OR ON AN INCREASE IN ALTITUDE STRESS COMBINED WITH
A SLOWDOWN IN THE SYSTEM'S MOVEMENT AS IT APPROACHES LAND. IN WHICH
CASE, THE SYSTEM COULD LAND WITH A SLIGHTLY LOWER INTENSITY THAN
EXPECTED. DIKELEDI SHOULD PASS OVER MADAGASCAR DURING THE NIGHT OF
SATURDAY TO SUNDAY, WEAKENING AS IT INTERACTS WITH THE LAND, BUT
SHOULD RETAIN ITS TROPICAL CHARACTERISTICS AND EMERGE INTO THE
MOZAMBIQUE CHANNEL ON SUNDAY. BACK IN VERY WARM WATERS IN A
FAVOURABLE CONTEXT, BUT POTENTIALLY CLOSE TO THE MALAGASY COAST, THE
SYSTEM COULD INTENSIFY AGAIN, BUT WITH A HIGH DEGREE OF UNCERTAINTY
DUE TO THE GREATER OR LESSER INTERACTION WITH THE LAND. IF THE SYSTEM
REMAINS SUFFICIENTLY FAR FROM THE COASTS, AS IS THE CASE FOR THIS
TRAJECTORY FORECAST, IT SHOULD ENCOUNTER GOOD CONDITIONS FOR
INTENSIFICATION, BUT IN THE CASE OF A LONGER TRANSIT ON OR NEAR LAND,
THE INTENSITY OF THE SYSTEM WOULD BE MUCH LOWER.
IMPACTS ON INHABITED LAND OVER THE NEXT 72 HOURS :
SAINT-BRANDON:
- WAVES OF 4 TO 5M OVERNIGHT. IMPROVING BY TOMORROW FRIDAY MORNING.
TROMELIN :
- WAVES OF 4 TO 5M FRIDAY AND SATURDAY MORNING. IMPROVEMENT SATURDAY
DURING THE DAY.
MADAGASCAR:
- GALE FORCE WINDS SATURDAY FROM MIDDAY ON EAST COAST OF ANTSIRANANA
PROVINCE. HURRICANE FORCE WINDS POSSIBLE ON SATURDAY EVENING IN THE
VICINITY OF THE LANDING ZONE (LOCATED SOMEWHERE BETWEEN SAMBAVA AND
ANTSIRANANA).=
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