UNCLAS //N03144// MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE WARNING// RMKS/ WTPN31 PGTW 180900 1. TROPICAL STORM 01W (YANYAN) WARNING NR 011 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 180600Z5 --- NEAR 13.9N3 146.6E7 MOVEMENT PAST SIX HOURS - 320 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 045 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT 075 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT REPEAT POSIT: 13.9N3 146.6E7 --- FORECASTS: 12 HRS, VALID AT: 181800Z8 --- 14.7N2 146.6E7 MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT RADIUS OF 034 KT WINDS - 095 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 095 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 010 DEG/ 05 KTS --- 24 HRS, VALID AT: 190600Z6 --- 15.6N2 146.8E9 MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT 100 NM SOUTHEAST QUADRANT 080 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 045 DEG/ 08 KTS --- 36 HRS, VALID AT: 191800Z9 --- 16.7N4 148.0E3 MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT 100 NM SOUTHEAST QUADRANT 090 NM SOUTHWEST QUADRANT 100 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 060 DEG/ 08 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 200600Z8 --- 17.5N3 149.5E9 MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT 090 NM SOUTHEAST QUADRANT 080 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 055 DEG/ 11 KTS --- 72 HRS, VALID AT: 210600Z9 --- 20.0N2 153.4E3 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT EXTRATROPICAL RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT 075 NM SOUTHEAST QUADRANT 075 NM SOUTHWEST QUADRANT 085 NM NORTHWEST QUADRANT --- REMARKS: 180900Z8 POSITION NEAR 14.1N6 146.6E7. TROPICAL STORM 01W (YANYAN), LOCATED APPROXIMATELY 85 NM EAST OF ROTA, HAS TRACKED NORTHWESTWARD AT 08 KNOTS OVER THE PAST 06 HOURS. THE WARNING POSITION IS BASED ON 180530Z7 VISIBLE AND ENHANCED INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 35, 45, AND 55 KNOTS. ANIMATED RADAR IMAGERY INDICATES THAT THE SYSTEM HAS RECENTLY BEGUN TO MOVE NORTHWARD. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 180600Z IS 16 FEET. REFER TO WWPN30 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 181500Z5, 182100Z2, 190300Z3 AND 190900Z9.//