WTIO21 PGTW 242230 RMKS/ 1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 120 NM EITHER SIDE OF A LINE FROM 16.5N 89.4E TO 20.5N 89.3E 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 23 TO 28 KNOTS. METSAT IMAGERY AT 242200Z INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 17.1N 89.4E. THE SYSTEM IS MOVING NORTHWARD AT 07 KNOTS. 2. REMARKS: MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 23 TO 28 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 252230Z. // 9924052106 114N 804E 15 9924052112 119N 807E 15 9924052118 125N 810E 15 9924052200 129N 815E 15 9924052206 130N 819E 15 9924052212 131N 824E 15 9924052218 131N 832E 15 9924052300 132N 847E 20 9924052306 134N 859E 20 9924052312 136N 866E 20 9924052318 143N 876E 20 9924052400 154N 886E 20 9924052406 158N 891E 20 9924052412 164N 894E 20 9924052418 171N 894E 25 NNNN