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最近明顯減弱除了涼水上湧以外更主要的因素是垂直風切增強了,但由於系統範圍很小因此仍存在大起大落的機會。
- WTIO30 FMEE 180052
- RSMC / TROPICAL CYCLONE CENTER / LA REUNION
- TROPICAL CYCLONE FORECAST WARNING (SOUTH-WEST INDIAN OCEAN)
- 0.A WARNING NUMBER: 11/6/20152016
- 1.A TROPICAL CYCLONE 6 (EMERAUDE)
- 2.A POSITION 2016/03/18 AT 0000 UTC:
- WITHIN 21 NM RADIUS OF POINT 10.1 S / 84.3 E
- (TEN DECIMAL ONE DEGREES SOUTH AND EIGHTY FOUR DECIMAL THREE DEGREES EAST)
- MOVEMENT : EAST 5 KT
- 3.A DVORAK ANALYSIS: 4.5/4.5/W 0.5/6 H
- 4.A CENTRAL PRESSURE: 975 HPA
- 5.A MAX AVERAGE WIND SPEED (10 MN): 70 KT
- RADIUS OF MAXIMUM WINDS (RMW) :15 KM
- 6.A EXTENSION OF WIND BY QUADRANTS (KM):
- 28 KT NE: 90 SE: 90 SW: 90 NW: 150
- 34 KT NE: 60 SE: 60 SW: 60 NW: 70
- 48 KT NE: 40 SE: 40 SW: 40 NW: 50
- 64 KT NE: 20 SE: 20 SW: 20 NW: 20
- 7.A FIRST CLOSED ISOBAR (PRESSURE / AVERAGE DIAM): 1007 HPA / 400 KM
- 8.A VERTICAL EXTENSION OF CYCLONE CIRCULATION : DEEP
- 1.B FORECASTS:
- 12H: 2016/03/18 12 UTC: 10.5 S / 85.3 E, MAX WIND=080 KT, TROPICAL CYCLONE
- 24H: 2016/03/19 00 UTC: 11.1 S / 86.4 E, MAX WIND=090 KT, INTENSE TROPICAL CYCLONE
- 36H: 2016/03/19 12 UTC: 11.6 S / 87.3 E, MAX WIND=095 KT, INTENSE TROPICAL CYCLONE
- 48H: 2016/03/20 00 UTC: 12.2 S / 87.6 E, MAX WIND=090 KT, INTENSE TROPICAL CYCLONE
- 60H: 2016/03/20 12 UTC: 12.8 S / 87.3 E, MAX WIND=085 KT, TROPICAL CYCLONE
- 72H: 2016/03/21 00 UTC: 13.1 S / 86.6 E, MAX WIND=080 KT, TROPICAL CYCLONE
- 2.B LONGER-RANGE OUTLOOK :
- 96H: 2016/03/22 00 UTC: 13.7 S / 84.7 E, MAX WIND=070 KT, TROPICAL CYCLONE
- 120H: 2016/03/23 00 UTC: 14.2 S / 83.0 E, MAX WIND=060 KT, SEVERE TROPICAL STORM
- 2.C ADDITIONAL INFORMATION:
- T=CI=4.5
- DURING THE LAST HOURS, THE EYE PATTERN BECAME UNSTABLE BECAUSE OF THE EAST-NORTH-EASTERLY CONSTRAINT, ANALYSED AT 15KT BY CIMSS (18Z). 1858Z AMSR2 MICRO-WAVES IMAGES SHOW THE ALTERATION OF EMERAUDE CORE WITH A SHIFT IN THE LOCATION OF THE EYE BETWEEN 37GHZ AND 89GHZ. HOWEVER, THANKS TO THE ACTIVE PHASE OF THE DIURNAL CYCLE, CLOUD TOPS GOT COLDER. MOREOVER, THE LAST IMAGES DO NOT SHOW THE PRESENCE OF A CIRRUS BOW ANYMORE, SUGEGSTING MAY BE A DECREASE OF THE VWS.
- OVER THE LAST 6 HOURS, EMERAUDE STARTED TO TRACK EASTWARDS UNDER THE STEERING FLOW OF A MID-LEVEL NEAR EQUATORIAL RIDGE. DURING THE WEEKEND, THE TRACK SHOULD TURN SOUTHWARDS THEN SOUTHWESTWARDS AS A SUBTROPICAL RIDGE SHOULD GRADUALLY BUILD SOUTH OF THE SYSTEM. GLOBAL MODELS ARE NOT IN GOOD AGREEMENT AND DIFFER SOMETIMES STRONGLY ABOUT THE FORWARD SPEED AND THE DIRECTION LEADING TO SIGNIFICANT SPREAD IN THE GUIDANCE BETWEEN THEM AND ALSO FROM ONE RUN TO THE OTHER. THE CURRENT FORECAST IS A BLEND OF THE LATEST MEAN TRACK FROM GFS-UK-EURO.
- ON THIS TRACK, ENVIRONMENTAL CONDITIONS WILL REMAIN MOSTLY CONDUCIVE DURING MOST OF THE FORECAST PERIOD. MOVING SOUTH, THE SYSTEM IS LIKELY TO BENEFIT FROM A DECREASE OF THE VERTICAL WIND SHEAR, AND AN INCREASE OF THE POLAR SIDE DIVERGENCE, FRIDAY AND SATURDAY. THE ENVIRONMENT COULD BE A LITTLE LESS CONDUCIVE LATER THIS WEEK-END ESSENTIALLY DUE TO AN INCREASE IN NORTHERLY VWS. ON THE CURRENT FORECAST TRACK, THE SYSTEM COULD PASS OVER SELF-INDUCED COOL WATERS. THESE CONDITIONS MAY PREVENT EMERAUDE FROM DEEPENING AGAIN. GIVEN THE SMALL SIZE OF THE SYSTEM, RAPID VARIATION (INCLUDING RAPID INTENSIFICATION AND RAPID DECAY) ARE LIKELY, BRINGING UNCERTAINTIES IN THE FORECAST.
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