WTPN31 PGTW 151500 REF/A/NAVPACMETOCCEN PEARL HARBOR HI/150851Z AUG 02// AMPN/TROPICAL CYCLONE FORMATION ALERT// RMKS/ 1. TROPICAL DEPRESSION 20W WARNING NR 001 02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 151200Z9 --- NEAR 13.4N8 113.4E9 MOVEMENT PAST SIX HOURS - 055 DEGREES AT 04 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT REPEAT POSIT: 13.4N8 113.4E9 --- FORECASTS: 12 HRS, VALID AT: 160000Z7 --- 13.9N3 114.2E8 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT VECTOR TO 24 HR POSIT: 065 DEG/ 05 KTS --- 24 HRS, VALID AT: 161200Z0 --- 14.3N8 115.1E8 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT VECTOR TO 36 HR POSIT: 030 DEG/ 05 KTS --- 36 HRS, VALID AT: 170000Z8 --- 15.2N8 115.6E3 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT VECTOR TO 48 HR POSIT: 350 DEG/ 06 KTS --- EXTENDED OUTLOOK: 48 HRS, VALID AT: 171200Z1 --- 16.4N1 115.4E1 MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT VECTOR TO 72 HR POSIT: 325 DEG/ 06 KTS --- 72 HRS, VALID AT: 181200Z2 --- 18.3N2 114.0E6 MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT --- REMARKS: 151500Z2 POSITION NEAR 13.5N9 113.6E1. TROPICAL DEPRESSION (TD) 20W, LOCATED APPROXIMATELY 540 NM SOUTH OF HONG KONG, CHINA, HAS TRACKED NORTHEASTWARD AT 04 KNOTS OVER THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 151130Z1 ENHANCED INFRARED SATELLITE IMAGERY AND A 151048Z9 SPECIAL SENSOR MICROWAVE IMAGE (SSMI) PASS. THE WARNING INTENSITY IS BASED ON SATELLITE CURRENT INTENSITY ESTIMATES OF 25 KNOTS. ANIMATED ENHANCED INFRARED IMAGERY AND THE SSMI PASS REVEAL A LOW LEVEL CIRCULATION CENTER (LLCC) WITH DEEP CONVECTION TO THE WEST AND SOUTH OF THE LLCC. A WESTERLY WIND BURST TO THE SOUTH OF THE LLCC IS ENHANCING WIND SPEEDS IN THAT REGION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 151200Z9 IS 20 FEET. REFER TO WWPW31 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. THIS WARNING SUPERSEDES AND CANCELS REF A, NAVPACMETOCCEN 150851Z AUG 02 TROPICAL CYCLONE FORMATION ALERT (WTPN21 PGTW 150900) NEXT WARNINGS AT 152100Z9, 160300Z0, 160900Z6 AND 161500Z3. REFER TO TYPHOON 19W (PHANFONE) WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES.// NNNN