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donaldfan|2013-9-6 19:38
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本帖最後由 donaldfan 於 2013-9-6 19:38 編輯
JTWC在06UTC已經評級LOW了
相信91W發展潛力還有的
中心附近風切強度大約10kts左右
渦度橙紅色
但是輻合及輻散仍需改善
AN AREA OF CONVECTION HAS PERSISTED NEAR 15.5N 115.9E,
APPROXIMATELY 426 NM SOUTH-SOUTHEAST OF HONG KONG. RECENT ANIMATED
MULTISPECTRAL SATELLITE IMAGERY DEPICTS ENHANCED CONVECTION SHEARED
TO THE WEST OF A POORLY DEFINED LOW-LEVEL CIRCULATION CENTER (LLCC).
A 060400Z SSMIS MICROWAVE IMAGE REVEALS WEAK FRAGMENTED BANDING THAT
IS SLIGHTLY CURVED JUST WEST OF THE LLCC. A 060139Z ASCAT PASS
INDICATES A WEAK LLCC WITH STRONGER WINDS ASSOCIATED WITH ENHANCED
CONVECTION ALONG THE WESTERN SEMICIRCLE. UPPER LEVEL ANALYSIS
INDICATES THE SYSTEM IS IN AN ENVIRONMENT OF LOW TO MODERATE (10 TO
20 KTS) VERTICAL WIND SHEAR WITH FAVORABLE DIFFLUENCE ALOFT. MAXIMUM
SUSTAINED SURFACE WINDS ARE ESTIMATED AT 10 TO 15 KNOTS. MINIMUM SEA
LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1008 MB. THE POTENTIAL FOR
THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24
HOURS IS LOW.
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