簽到天數: 3291 天 [LV.Master]伴壇終老
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t02436|2014-7-18 00:01
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CPHC從Low直接提升到High
An area of low pressure located about 1000 miles east southeast of the Big Island of Hawaii has been moving west northwest at less than 10 mph. An area of showers and thunderstorms associated with the disturbance has become better organized overnight. Environmental conditions appear to be conducive for development, and a tropical depression may be forming. Advisories may be initiated later today for this system if current trends continue. After 24 to 36 hours, upper-level winds are expected to become unfavorable for tropical cyclone development.
* Formation chance through 48 hours, high, 80 percent.
JTWC也在稍早發出TCFA
FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 180
NM EITHER SIDE OF A LINE FROM 11.3N 140.7W TO 15.2N 145.9W WITHIN THE
NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY ISSUANCE OF
NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME. WINDS IN THE AREA
ARE ESTIMATED TO BE 20 TO 25 KNOTS. METSAT IMAGERY AT 171131Z
INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 11.9N 141.5W. THE
SYSTEM IS MOVING NORTHWESTWARD AT 06 KNOTS.
2. REMARKS: AN AREA OF CONVECTION HAS PERSISTED NEAR 11.9N 141.5W,
APPROXIMATELY 910 NM EAST-SOUTHEAST OF HILO, HAWAII. ANIMATED
ENHANCED INFRARED SATELLITE IMAGERY DEPICTS IMPROVED ORGANIZATION OF
DEEP CENTRALIZED CONVECTION OVER A CONSOLIDATING LOW-LEVEL
CIRCULATION CENTER (LLCC). A RECENT 171059Z TRMM MICROWAVE PASS
INDICATES THE FORMATIVE BANDING IS BEGINNING TO WRAP TOWARDS THE
LLCC. UPPER LEVEL ANALYSIS INDICATES A FAVORABLE ENVIRONMENT
CHARACTERIZED BY LOW VERTICAL WIND SHEAR AND GOOD DIVERGENCE ALOFT.
SEA SURFACE TEMPERATURES IN THE AREA ARE FAVORABLE FOR CONTINUED
DEVELOPMENT. DYNAMIC MODELS INDICATE A WEST-NORTHWEST TRACK TOWARDS
THE ISLANDS OF HAWAII AS THE CYCLONE DEVELOPS. MAXIMUM SUSTAINED
SURFACE WINDS ARE ESTIMATED AT 20 TO 25 KTS. MINIMUM SEA LEVEL
PRESSURE IS ESTIMATED TO BE NEAR 1004 MB. DUE TO THE INCREASED
CONSOLIDATION OF THE LLCC, THE POTENTIAL FOR DEVELOPMENT OF A
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS HIGH.
整體對流大幅度改善
螺旋性明顯
成為中太首旋機率相當高...
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