UNCLAS //N03144// MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE WARNING// RMKS/ WTPN31 PGTW 041500 1. TROPICAL STORM 31W (PONGSONA) WARNING NR 008 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 041200Z7 --- NEAR 8.4N2 158.9E3 MOVEMENT PAST SIX HOURS - 270 DEGREES AT 05 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT OVER WATER 110 NM NORTHWEST QUADRANT REPEAT POSIT: 8.4N2 158.9E3 --- FORECASTS: 12 HRS, VALID AT: 050000Z5 --- 8.5N3 157.3E6 MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT RADIUS OF 050 KT WINDS - 020 NM RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 110 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 280 DEG/ 10 KTS --- 24 HRS, VALID AT: 051200Z8 --- 8.8N6 155.2E3 MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT RADIUS OF 050 KT WINDS - 030 NM RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT OVER WATER 110 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 280 DEG/ 13 KTS --- 36 HRS, VALID AT: 060000Z6 --- 9.3N2 152.7E5 MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT RADIUS OF 050 KT WINDS - 035 NM RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 090 NM SOUTHWEST QUADRANT OVER WATER 100 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 285 DEG/ 13 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 061200Z9 --- 9.9N8 150.2E8 MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT RADIUS OF 050 KT WINDS - 035 NM RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT 075 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 110 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 295 DEG/ 12 KTS --- 72 HRS, VALID AT: 071200Z0 --- 11.8N0 145.9E9 MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT RADIUS OF 050 KT WINDS - 060 NM NORTHEAST QUADRANT 040 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 125 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 085 NM SOUTHWEST QUADRANT 125 NM NORTHWEST QUADRANT OVER WATER --- REMARKS: 041500Z0 POSITION NEAR 8.4N2 158.5E9. TROPICAL STORM (TS) 31W (PONGSONA), LOCATED APPROXIMATELY 95 NM NORTH-NORTHEAST OF POHNPEI, HAS TRACKED WESTWARD AT 05 KNOTS OVER THE PAST SIX HOURS. THE WARNING POSITION IS BASED ON 041130Z9 ENHANCED INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 45 AND 55 KNOTS AND A 040657Z2 QUIKSCAT PASS. ANIMATED WATER VAPOR SATELLITE IMAGERY INDICATES INCREASED POLEWARD OUTFLOW OVER THE PAST SIX HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 041200Z7 IS 18 FEET. REFER TO WWPW31 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 042100Z7, 050300Z8, 050900Z4 AND 051500Z1.// NNNN