UNCLAS //N03144// MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE WARNING// RMKS/ WTPN31 PGTW 200900 1. TROPICAL STORM 01W (YANYAN) WARNING NR 019 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 200600Z8 --- NEAR 17.0N8 153.4E3 MOVEMENT PAST SIX HOURS - 075 DEGREES AT 14 KTS POSITION ACCURATE TO WITHIN 045 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER RADIUS OF 034 KT WINDS - 080 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT REPEAT POSIT: 17.0N8 153.4E3 --- FORECASTS: 12 HRS, VALID AT: 201800Z1 --- 17.6N4 155.2E3 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 24 HR POSIT: 065 DEG/ 09 KTS --- 24 HRS, VALID AT: 210600Z9 --- 18.3N2 157.0E3 MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 36 HR POSIT: 070 DEG/ 09 KTS --- 36 HRS, VALID AT: 211800Z2 --- 18.9N8 158.7E1 MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 200900Z1 POSITION NEAR 17.2N0 153.9E8. TROPICAL STORM (TS) 01W (YANYAN), LOCATED APPROXIMATELY 455 NM EAST- NORTHEAST OF SAIPAN, HAS TRACKED EAST-NORTHEASTWARD AT 14 KNOTS OVER THE PAST 06 HOURS. THE WARNING POSITION IS BASED ON 192330Z8 VISIBLE SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 35 AND 45 KNOTS. ANIMATED MULTISPECTRAL IMAGERY DEPICTS A FULLY EXPOSED LOW LEVEL CIRCULATION CENTER SOUTHWEST OF THE DEEP CONVECTION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 200600Z8 IS 14 FEET. REFER TO WWPN31 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 201500Z8, 202100Z5, 210300Z6 AND 210900Z2.//