WTPN21 PGTW 120600 RMKS/ 1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN 120 NM EITHER SIDE OF A LINE FROM 6.4N 142.0E TO 6.8N 139.3E 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 18 TO 22 KNOTS. METSAT IMAGERY AT 120230Z INDICATES THAT A CIRCULATION CENTER IS LOCATED NEAR 6.4N 141.6E. THE SYSTEM IS MOVING WESTWARD AT 14 KNOTS. 2. REMARKS: MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 18 TO 22 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1006 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 130600Z.// 9523110918 51N1490E 15 9523111000 53N1484E 15 9523111006 55N1478E 15 9523111012 57N1475E 15 9523111018 60N1472E 15 9523111100 61N1467E 15 9523111106 61N1460E 15 9523111112 61N1448E 15 9523111118 64N1430E 20 9523111200 64N1416E 20 NNNN