WTPN31 PGTW 310900 MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE WARNING// RMKS/ 1. TROPICAL STORM 13W (NAMTHEUN) WARNING NR 026 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 310600Z0 --- NEAR 33.1N7 133.4E1 MOVEMENT PAST SIX HOURS - 305 DEGREES AT 11 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT OVER WATER 050 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT OVER WATER 050 NM NORTHWEST QUADRANT OVER WATER RADIUS OF 034 KT WINDS - 130 NM NORTHEAST QUADRANT OVER WATER 130 NM SOUTHEAST QUADRANT 120 NM SOUTHWEST QUADRANT OVER WATER 110 NM NORTHWEST QUADRANT OVER WATER REPEAT POSIT: 33.1N7 133.4E1 --- FORECASTS: 12 HRS, VALID AT: 311800Z3 --- 34.0N7 131.7E2 MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT OVER WATER 100 NM SOUTHEAST QUADRANT OVER WATER 075 NM SOUTHWEST QUADRANT OVER WATER 070 NM NORTHWEST QUADRANT OVER WATER VECTOR TO 24 HR POSIT: 315 DEG/ 07 KTS --- 24 HRS, VALID AT: 010600Z7 --- 35.0N8 130.5E9 MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT RADIUS OF 034 KT WINDS - 085 NM NORTHEAST QUADRANT 085 NM SOUTHEAST QUADRANT OVER WATER 070 NM SOUTHWEST QUADRANT OVER WATER 070 NM NORTHWEST QUADRANT OVER WATER VECTOR TO 36 HR POSIT: 340 DEG/ 07 KTS --- 36 HRS, VALID AT: 011800Z0 --- 36.3N2 129.9E1 MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT 050 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT OVER WATER 060 NM NORTHWEST QUADRANT OVER WATER VECTOR TO 48 HR POSIT: 355 DEG/ 08 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 020600Z8 --- 37.8N8 129.8E0 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 040 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT OVER WATER 045 NM NORTHWEST QUADRANT VECTOR TO 72 HR POSIT: 015 DEG/ 10 KTS --- 72 HRS, VALID AT: 030600Z9 --- 41.6N1 131.2E7 MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT EXTRATROPICAL --- REMARKS: 310900Z3 POSITION NEAR 33.3N9 133.0E7. TROPICAL STORM (TS) 13W (NAMTHEUN), LOCATED APPROXIMATELY 80 NM EAST-SOUTHEAST OF IWAKUNI, JAPAN, HAS TRACKED NORTHWESTWARD AT 11 KNOTS OVER THE PAST 06 HOURS. THE WARNING POSITION IS BASED ON 310530Z2 MULTISPECTRAL SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 45 AND 55 KNOTS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY REVEALS THAT THE DEEP CONVECTION HAS DECREASED OVER THE PAST 06 HOURS AS THE SYSTEM INTERACTS WITH LAND. THE LOW LEVEL CIRCULATION CENTER IS ABOUT TO MAKE LANDFALL OVER SHIKOKU, JAPAN. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 310600Z0 IS 19 FEET. REFER TO WWPW30 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 311500Z0, 312100Z7, 010300Z4 AND 010900Z0.//