簽到天數: 2141 天 [LV.Master]伴壇終老
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周子堯@FB|2019-9-8 14:31
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JTWC06Z評級Medium
(1) THE AREA OF CONVECTION (INVEST 95W) PREVIOUSLY LOCATED
NEAR 12.7N 149.8E IS NOW LOCATED NEAR 13.5N 144.3E, APPROXIMATELY
23 NM WEST-NORTHWEST OF GUAM. ANIMATED MULTISPECTRAL SATELLITE
IMAGERY DEPICTS A BROAD LOW-LEVEL CIRCULATION (LLC) WITH FLARING,
DISORGANIZED DEEP CONVECTION. A 072337Z AMSU 89GHZ MICROWAVE IMAGE
INDICATES A WEAKLY DEFINED LLC. HOWEVER, A 072338Z ASCAT-B IMAGE
SHOWS A DEFINED, SYMMETRIC CIRCULATION WITH 15-20 KNOT WINDS.
SURFACE OBSERVATIONS FROM PGUM INDICATE SLP NEAR 1005.5MB WITH A 24-
HOUR SLP DECREASE OF 1.6MB. UPPER-LEVEL ANALYSIS INDICATES A
MARGINALLY FAVORABLE ENVIRONMENT WITH MODERATE TO HIGH (20-25 KNOTS)
EASTERLY VERTICAL WIND SHEAR OFFSET BY BROAD DIFFLUENCE. THE MOST
RECENT SOUNDING FROM GUAM SHOWS DEEP EASTERLY FLOW OVER GUAM WITH A
DEEP MOISTURE PROFILE. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED
AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE
NEAR 1004 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS UPGRADED TO MEDIUM.
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