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c789654|2011-12-21 08:55
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WTPS21 PGTW 202130MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//SUBJ/TROPICAL CYCLONE FORMATION ALERT//RMKS/1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN150 NM EITHER SIDE OF A LINE FROM 13.4S 155.2E TO 18.0S 157.9EWITHIN THE NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFYISSUANCE OF NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME.WINDS IN THE AREA ARE ESTIMATED TO BE 25 TO 30 KNOTS. METSAT IM-AGERY AT 202030Z INDICATES THAT A CIRCULATION CENTER IS LOCATEDNEAR 14.1S 155.6E. THE SYSTEM IS MOVING EAST-SOUTHEASTWARD AT 05KNOTS.2. REMARKS: THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 14.0S 154.8E IS NOW LOCATED NEAR 14.1S 155.7E, APPROXIMATELY 625 NM EAST-NORTHEAST OF CAIRNS, AUSTRALIA. ANIMATED INFRARED SATELLITE IMAGERY DEPICTS PERSISTENT DEEP CONVECTION OVER A CONSOLIDATING LOW-LEVEL CIRCULATION CENTER (LLCC). A 201747Z SSMI IMAGE DEPICTS IMPROVED, FORMATIVE CONVECTIVE BANDING WRAPPING INTO THE DEEP CONVECTION AROUND THE LLCC. THE TOTAL PRECIPITABLE WATER LOOP ALSO INDICATES A CONSOLIDATING SYSTEM WITH A DISTINCT DEEP MOISTURE ENVELOPE. RECENT SCATTEROMETERY DATA SUPPORTS A STRENGTHENING LLCC WITH 20-25 KNOT WINDS. ADDITIONALLY, SHIP OBSERVATIONS TO THE NORTH AND SOUTH OF THE SYSTEM SUPPORT THE LLCC POSITION AND INTENSITY ASSESSMENTS. UPPER-LEVEL ANALYSIS SHOWS STRONG DIFFLUENCE OVER THE LLCC WITH WEAK VERTICAL WIND SHEAR (VWS) AND ENHANCED POLEWARD OUTFLOW. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 20 TO 25 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1001 MB. DUE TO INCREASED CONSOLIDATION OF THE LLCC, THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS HIGH.3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY 212130Z.//NNNN
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