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霧峰追風者|2018-6-14 08:35
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JTWC 22Z評級Low
(3) AN AREA OF CONVECTION (INVEST 95W) HAS PERSISTED NEAR
20.9N 115.1E, APPROXIMATELY 95 NM SOUTHEAST OF HONG KONG. ANIMATED
ENHANCED INFRARED SATELLITE IMAGERY SHOWS FLARING CENTRAL CONVECTION
WITH FORMATIVE BANDING WRAPPING INTO A COVERED BROAD LOW LEVEL
CIRCULATION. A 131831Z GMI MICROWAVE IMAGE REFLECTS THE BROAD AREA
OF TURNING AND MULTIPLE CENTERS OF DEEP CONVECTION, LENDING LOW
CONFIDENCE TO THE POSITION. A 131400Z ASCAT PASS SHOWED 20-25 KT
WINDS TO THE SOUTH OF THE CENTER ASSOCIATED WITH WESTERLY MONSOON
SURGE, AND 10-15 KT WINDS IN THE NORTHERN SECTOR OF THE SYSTEM
CLOSER TO LAND. ENVIRONMENTAL ANALYSIS SHOWS GOOD EQUATORWARD
OUTFLOW FROM 95W SUPPORTING MULTIPLE AREAS OF DEEP CONVECTION, AS
POLEWARD OUTFLOW IS PREVENTED BY THE MIDLATITUDE JET SITTING
DIRECTLY TO THE NORTH. 95W IS LOCATED IN AN AREA OF LOW TO MODERATE
(10-20 KT) WIND SHEAR. 95W IS SITUATED ON THE BORDER OF THE BAIU
FRONT, A CLIMATOLOGICAL FEATURE IN THIS REGION AT THIS TIME OF YEAR,
AND THUS IS UNDER A MILD TEMPERATURE GRADIENT ALREADY. A 132000Z
AMSU RADIAL CROSS-SECTION SHOWS A WEAK WARM CORE ANOMALY ALOFT,
INDICATING A BORDERLINE TROPICAL SYSTEM. GLOBAL MODELS SHOW 95W
MOVING TO THE EAST TO NORTHEAST, WITH STRONGER SOUTHWESTERLY
MONSOONAL FLOW WRAPPING UP INTO A MORE COHERENT SYSTEM IN THE NEXT 1-
2 DAYS. HOWEVER, 95W HAS THE POTENTIAL TO BECOME SUBTROPICAL OR
EXTRATROPICAL DUE TO ITS PROXIMITY TO THE FRONTAL BOUNDARY AND
BAROCLINIC ZONE, AND A MIDLATITUDE TROUGH THAT IS CURRENTLY PASSING
THROUGH THE REGION. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED
AT 10 TO 15 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE
NEAR 996 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS LOW.
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