簽到天數: 3291 天 [LV.Master]伴壇終老
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t02436|2015-12-11 07:50
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JTWC提升評級至Medium
B. TROPICAL DISTURBANCE SUMMARY:
(1) THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 7.4N
144.3E, IS NOW LOCATED NEAR 8.2N 140.8E, APPROXIMATELY 175 NM EAST-
SOUTHEAST OF YAP. RECENT ANIMATED INFRARED SATELLITE IMAGERY SHOWS
DEEP CONVECTION FLARING ALONG THE EASTERN PERIPHERY OF AN ELONGATED
LOW LEVEL CIRCULATION CENTER (LLCC) EVIDENT IN A 101229Z ASCAT PASS
AND A 101546Z RSCAT PASS. THIS DISTURBANCE IS LOCATED EQUATORWARD OF
AN UPPER-LEVEL RIDGE AXIS, IN AREA OF STRONG WESTWARD UPPER-LEVEL
DIFFLUENCE AND MODERATE EASTERLY VERTICAL WIND SHEAR. THE ASCAT AND
RSCAT DATA INDICATE THAT STRONGER WINDS ARE CONFINED TO THE EASTERN
AND NORTHERN PERIPHERIES OF THE DEVELOPING LLCC, WITH MUCH LIGHTER
10-15 KNOT WINDS ALONG THE WESTERN AND SOUTHERN PERIPHERIES.
HOWEVER, ENVIRONMENTAL CONDITIONS ARE CONDUCIVE FOR CONTINUED
CONVECTIVE DEVELOPMENT, AND NUMERICAL MODELS INDICATE THAT THE LLCC
WILL LIKELY CONSOLIDATE INTO A TROPICAL CYCLONE OVER THE NEXT FEW
DAYS. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20
KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1006 MB.
BASED ON PERSISTENT DEEP CONVECTION OBSERVED ALONG THE EASTERN
PERIPHERY OF THE LLCC AND GENERALLY FAVORABLE UPPER-LEVEL
CONDITIONS, THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS UPGRADED TO MEDIUM.
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