WTPN31 PGTW 200900 1. TROPICAL STORM 09W (TEMBIN) WARNING NR 011 02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 200600Z8 --- NEAR 30.6N9 141.6E2 MOVEMENT PAST SIX HOURS - 005 DEGREES AT 07 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT RADIUS OF 035 KT WINDS - 070 NM EAST SEMICIRCLE 050 NM ELSEWHERE REPEAT POSIT: 30.6N9 141.6E2 --- FORECASTS: 12 HRS, VALID AT: 201800Z1 --- 31.9N3 141.8E4 MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT RADIUS OF 035 KT WINDS - 065 NM EAST SEMICIRCLE 045 NM ELSEWHERE VECTOR TO 24 HR POSIT: 015 DEG/ 07 KTS --- 24 HRS, VALID AT: 210600Z9 --- 33.2N8 142.2E9 MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT RADIUS OF 035 KT WINDS - 055 NM SOUTHEAST SEMICIRCLE 040 NM ELSEWHERE VECTOR TO 36 HR POSIT: 020 DEG/ 08 KTS --- 36 HRS, VALID AT: 211800Z2 --- 34.7N4 142.9E6 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 48 HR POSIT: 030 DEG/ 09 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 220600Z0 --- 36.2N1 143.9E7 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 72 HR POSIT: 030 DEG/ 09 KTS --- 72 HRS, VALID AT: 230600Z1 --- 39.3N5 146.3E4 MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 200900Z1 POSITION NEAR 30.9N2 141.6E2. TROPICAL STORM (TS) 09W (TEMBIN), LOCATED 315 NM SOUTH-SOUTHEAST OF TOKYO, HAS TRACKED NORTHWARD AT 07 KNOTS DURING THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 200530Z0 VISIBLE AND INFRARED SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 45 KNOTS. ANIMATED VISIBLE SATELLITE IMAGERY INDICATES AN EXPOSED LOW LEVEL CIRCULATION CENTER WITH THE CONVECTION SHEARED 18 NM TO THE EAST-NORTHEAST. TS 09W IS FORECAST TO TRACK INCREASINGLY NORTH-NORTHEASTWARD THROUGH THE FORECAST PERIOD WITH THE LOW TO MID-LEVEL SUBTROPICAL RIDGE TO THE EAST ACTING AS THE DOMINANT STEERING MECHANISM. THE SYSTEM IS FORECAST TO MAINTAIN ITS CURRENT INTENSITY OVER THE NEXT 12 TO 24 HOURS THEN BEGIN WEAKENING THROUGH THE END OF THE FORECAST PERIOD. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 200600Z8 IS 18 FEET. REFER TO WWPW30 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 201500Z8 (DTG 201351Z2), 202100Z5 (DTG 201951Z8), 210300Z6 (DTG 210151Z0) AND 210900Z2 (DTG 210751Z6). REFER TO TROPICAL DEPRESSION 10W WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES.// NNNN