WTPN31 PGTW 190300 1. TROPICAL STORM 20W (VONGFONG) WARNING NR 015 02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 190000Z0 --- NEAR 18.6N5 111.6E9 MOVEMENT PAST SIX HOURS - 360 DEGREES AT 06 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT REPEAT POSIT: 18.6N5 111.6E9 --- FORECASTS: 12 HRS, VALID AT: 191200Z3 --- 20.5N7 111.2E5 MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT 060 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 330 DEG/ 12 KTS --- 24 HRS, VALID AT: 200000Z2 --- 22.5N9 109.9E9 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND VECTOR TO 36 HR POSIT: 320 DEG/ 12 KTS --- 36 HRS, VALID AT: 201200Z5 --- 24.4N0 108.2E1 MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 190300Z3 POSITION NEAR 19.1N1 111.5E8. ROPICAL STORM (TS) 20W (VONGFONG), LOCATED APPROXIMATELY 260 NM SOUTHWEST OF HONG KONG, CHINA, HAS TRACKED NORTHWARD AT 06 KNOTS OVER THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 182330Z7 MULTISPECTRAL SATELLITE IMAGERY. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 35 AND 45 KNOTS AND SYNOPTIC OBSERVATIONS. ANIMATED ENHANCED INFRARED IMAGERY INDICATES THAT THE SYSTEM CONTINUES TO DEVELOP IN A WEAK VERTICAL SHEAR ENVIROMENT WITH CONVECTION FORMING OVER THE LOW LEVEL CIRCULATION CENTER OVER THE LAST 12 HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 190000Z0 IS 20 FEET. REFER TO WWPN30 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. NEXT WARNINGS AT 190900Z9, 191500Z6, 192100Z3 AND 200300Z5. REFER TO TYPHOON 19W (PHANFONE) WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES.// NNNN