WTPN31 PGTW 100900 SUBJ: TROPICAL CYCLONE WARNING 1. TYPHOON 08W (CHATAAN) WARNING NR 050 03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 100600Z7 --- NEAR 31.8N2 135.9E8 MOVEMENT PAST SIX HOURS - 045 DEGREES AT 17 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 070 NM RADIUS OF 034 KT WINDS - 130 NM NORTHEAST QUADRANT OVER WATER 140 NM SOUTHEAST QUADRANT 120 NM SOUTHWEST QUADRANT 130 NM NORTHWEST QUADRANT OVER WATER REPEAT POSIT: 31.8N2 135.9E8 --- FORECASTS: 12 HRS, VALID AT: 101800Z0 --- 33.7N3 138.2E4 MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT BECOMING EXTRATROPICAL RADIUS OF 050 KT WINDS - 065 NM OVER WATER RADIUS OF 034 KT WINDS - 125 NM NORTHEAST QUADRANT OVER WATER 135 NM SOUTHEAST QUADRANT 115 NM SOUTHWEST QUADRANT 125 NM NORTHWEST QUADRANT OVER WATER VECTOR TO 24 HR POSIT: 040 DEG/ 14 KTS --- 24 HRS, VALID AT: 110600Z8 --- 35.8N6 140.3E8 MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 105 NM NORTHEAST QUADRANT OVER WATER 120 NM SOUTHEAST QUADRANT 100 NM SOUTHWEST QUADRANT OVER WATER 105 NM NORTHWEST QUADRANT OVER WATER VECTOR TO 36 HR POSIT: 035 DEG/ 18 KTS --- 36 HRS, VALID AT: 111800Z1 --- 38.7N8 143.1E9 MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT BECOMING EXTRATROPICAL RADIUS OF 034 KT WINDS - 080 NM NORTHEAST QUADRANT 100 NM SOUTHEAST QUADRANT 085 NM SOUTHWEST QUADRANT OVER WATER 075 NM NORTHWEST QUADRANT OVER WATER VECTOR TO 48 HR POSIT: 025 DEG/ 21 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 120600Z9 --- 42.5N1 145.7E7 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT EXTRATROPICAL --- REMARKS: 100900Z0 POSITION NEAR 32.3N8 136.5E5. TYPHOON (TY) 08W (CHATAAN), LOCATED APPROXIMATELY 280 NM SOUTHWEST OF TOKYO BAY, HAS TRACKED NORTHEASTWARD AT 17 KNOTS DURING THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 100530Z9 VISIBLE SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 55 AND 65 KNOTS. ANIMATED WATER VAPOR IMAGERY DEPICTS SIGNIFICANT EROSION OF CONVECTION IN THE WESTERN SEMICIRCLE AS THE SYSTEM TRACKS INTO THE BAROCLINIC ZONE. ANIMATED MULTISPECTRAL IMAGERY INDICATES THE LOW LEVEL CIRCULATION CENTER (LLCC) IS SOUTHWEST OF THE DEEP CONVECTION DUE TO INCREASING VERTICAL WIND SHEAR. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 100600Z7 IS 18 FEET. REFER TO WWPW30 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 101500Z7, 102100Z4, 110300Z5 AND 110900Z1. REFER TO TYPHOON 10W (HALONG) WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES. REFER TO TROPICAL DEPRESSION 11W (NAKRI) WARNINGS (WTPN33 PGTW) FOR SIX-HOURLY UPDATES.// NNNN