WTPN21 PGTW 110930
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT (INVEST 93W)//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
135 NM EITHER SIDE OF A LINE FROM 17.0N 119.4E TO 18.0N 114.9E
WITHIN THE NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY
ISSUANCE OF NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME.
WINDS IN THE AREA ARE ESTIMATED TO BE 15 TO 20 KNOTS. METSAT
IMAGERY AT 110600Z INDICATES THAT A CIRCULATION CENTER IS LOCATED
NEAR 17.0N 118.9E. THE SYSTEM IS MOVING WESTWARD AT 08 KNOTS.
2. REMARKS: THE AREA OF CONVECTION (INVEST 93W) PREVIOUSLY LOCATED
NEAR 16.9N 119.2E IS NOW LOCATED NEAR 17.0N 118.9E, APPROXIMATELY
183 NM NORTHWEST OF MANILA, PHILIPPINES. ANIMATED MULTISPECTRAL
SATELLITE IMAGERY AND AN 110547Z AMSR2 89GHZ MICROWAVE IMAGE REVEAL
SHALLOW FRAGMENTED FORMATIVE BANDING WRAPPING INTO A LOW LEVEL
CIRCULATION WITH LIMITED DEEP CONVECTION. AN 110204Z ASCAT-B PASS
REVEALS MAINLY 10-15KT WINDS WITH SOME 20KT WINDS DISPLACED TO THE
NORTH. INVEST 93W IS IN A FAVORABLE ENVIRONMENT FOR DEVELOPMENT WITH
LOW (<15KTS) VERTICAL WIND SHEAR, MODERATE UPPER LEVEL DIFFLUENCE,
AND WARM (29-30C) SEA SURFACE TEMPERATURES. GLOBAL MODELS ARE IN
STRONG AGREEMENT THAT INVEST 93W WILL QUICKLY CONSOLIDATE AND TRACK WEST-NORTHWESTWARD ACROSS THE SOUTH CHINA SEA. MAXIMUM SUSTAINED
SURFACE WINDS ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL
PRESSURE IS ESTIMATED TO BE NEAR 1001 MB. 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
120930Z.//
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