SUBJ: TROPICAL STORM 18W (NARRA) WARNING NR 013 WTPN32 PGTW 232100 1. TROPICAL STORM 18W (NARRA) WARNING NR 013 03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 231800Z --- NEAR 20.4N 107.8E MOVEMENT PAST SIX HOURS - 240 DEGREES AT 02 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE AND RADAR PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 020 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 040 NM NORTHWEST QUADRANT REPEAT POSIT: 20.4N 107.8E --- FORECASTS: 12 HRS, VALID AT: 240600Z --- 20.1N 107.7E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 020 NM NORTHEAST QUADRANT 030 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 030 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 105 DEG/ 03 KTS --- 24 HRS, VALID AT: 241800Z --- 19.9N 108.4E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 015 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT VECTOR TO 36 HR POSIT: 055 DEG/ 03 KTS --- 36 HRS, VALID AT: 250600Z --- 20.3N 109.0E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 010 NM NORTHEAST QUADRANT 020 NM SOUTHEAST QUADRANT 030 NM SOUTHWEST QUADRANT 010 NM NORTHWEST QUADRANT VECTOR TO 48 HR POSIT: 035 DEG/ 04 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 251800Z --- 21.0N 109.5E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 010 NM NORTHEAST QUADRANT 015 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 010 NM NORTHWEST QUADRANT VECTOR TO 60 HR POSIT: 360 DEG/ 06 KTS --- 60 HRS, VALID AT: 260600Z --- 22.1N 109.5E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND VECTOR TO 72 HR POSIT: 310 DEG/ 03 KTS --- 72 HRS, VALID AT: 261800Z --- 22.5N 109.0E MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 232100Z POSITION NEAR 20.3N 107.8E. 23AUG26. TROPICAL STORM 18W (NARRA), LOCATED APPROXIMATELY 113 NM EAST-SOUTHEAST OF HANOI, VIETNAM, HAS TRACKED WEST-SOUTHWESTWARD AT 02 KNOTS OVER THE PAST SIX HOURS. MINIMUM CENTRAL PRESSURE AT 231800Z IS 992 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 231800Z IS 12 FEET. NEXT WARNINGS AT 240300Z, 240900Z, 241500Z AND 242100Z. REFER TO TYPHOON 17W (SAUDEL) WARNINGS (WTPN31 PGTW) FOR SIX-HOURLY UPDATES. REFER TO TROPICAL DEPRESSION 19W (NINETEEN) WARNINGS (WTPN33 PGTW) FOR SIX-HOURLY UPDATES. // BT #0001 NNNN