WTXS21 PGTW 201500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT (INVEST 93S)//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
160 NM EITHER SIDE OF A LINE FROM 12.8S 100.8E TO 13.4S 95.2E
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 25 TO 30 KNOTS. METSAT
IMAGERY AT 201200Z INDICATES THAT A CIRCULATION CENTER IS LOCATED
NEAR 13.1S 99.3E. THE SYSTEM IS MOVING WESTWARD AT 16 KNOTS.
2. REMARKS: THE AREA OF CONVECTION (INVEST 93S) PREVIOUSLY LOCATED 
NEAR 12.8S 100.9E IS NOW LOCATED NEAR 13.1S 99.3E, APPROXIMATELY 
153NM ESE OF COCOS ISLANDS, AUSTRALIA. ANIMATED ENHANCED INFRARED 
SATELLITE IMAGERY SHOWS DEEP CONVECTION OVER A CONSOLIDATING LOW LEVEL 
CIRCULATION CENTER (LLCC). ADDITIONALLY, 201202Z SSMIS 91 GHZ MICROWAVE 
IMAGE DEPICTS CONVECTIVE BANDING WRAPPING INTO THE LLCC. ENVIRONMENTAL 
ANALYSIS REVEALS A FAVORABLE ENVIRONMENT FOR DEVELOPMENT CHARACTERIZED BY 
POLEWARD OUTFLOW AND WARM (30-31C) SEA SURFACE TEMPERATURES OFFSET BY 
MODERATE (15-20KTS) VERTICAL WIND SHEAR. GLOBAL MODELS ARE IN GOOD 
AGREEMENT THAT INVEST 93S WILL TRACK GENERALLY WESTWARD AS IT 
CONSOLIDATES AND STRENGTHENS. MAXIMUM SUSTAINED SURFACE WINDS ARE 
ESTIMATED AT 25 TO 30 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO 
BE NEAR 1000 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 
211500Z.//
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