ALERT ATCF MIL 91X XXX 210530060000 2021053006 9.9 258.8 11.7 254.2 120 10.0 258.5 300830 2105300821 1 SUBJ/TROPICAL CYCLONE FORMATION ALERT REISSUED// WTPN21 PHNC 300830 REF/A/JOINT TYPHOON WRNCEN PEARL HARBOR HI/300821Z MAY 21// AMPN/REF IS TROPICAL CYCLONE FORMATION ALERT (WTPN21 PHNC 300830)// RMKS/ 1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 120 NM EITHER SIDE OF A LINE FROM 9.9N 101.2W TO 11.7N 105.8W 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 20 TO 25 KNOTS. METSAT IMAGERY AT 300600Z INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 10.0N 101.5W. THE SYSTEM IS MOVING WEST-NORTHWESTWARD AT 08 KNOTS. 2. REMARKS: MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 20 TO 25 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 HIGH. THIS SUPERSEDES REF A. 3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY 310830Z. // 9121052818 90N 975W 15 9121052900 92N 981W 15 9121052906 94N 987W 15 9121052912 95N 993W 15 9121052918 96N 999W 20 9121053000 98N1007W 25 9121053006 100N1015W 25 NNNN