WTPN31 PGTW 301500 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL DEPRESSION 01W (ONE) WARNING NR 001// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/292121ZMAR2022// AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.// RMKS/ 1. TROPICAL DEPRESSION 01W (ONE) WARNING NR 001 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 301200Z --- NEAR 11.8N 110.3E MOVEMENT PAST SIX HOURS - 285 DEGREES AT 07 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE, RADAR AND SYNOPTIC DATA PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY REPEAT POSIT: 11.8N 110.3E --- FORECASTS: 12 HRS, VALID AT: 310000Z --- 12.3N 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 VECTOR TO 24 HR POSIT: 295 DEG/ 07 KTS --- 24 HRS, VALID AT: 311200Z --- 12.9N 107.7E MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 301500Z POSITION NEAR 11.9N 110.0E. 30MAR22. TROPICAL DEPRESSION (TD) 01W (ONE), LOCATED APPROXIMATELY 220 NM EAST-NORTHEAST OF HO CHI MINH CITY, VIETNAM, HAS TRACKED WEST- NORTHWESTWARD AT 07 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY AND RADAR IMAGERY INDICATE A CONSOLIDATING SYSTEM WITH IMPROVED CONVECTIVE BANDING OVER THE WESTERN AND SOUTHERN QUADRANTS AND PERSISTENT DEEP CONVECTION OVER THE CENTER. A 301219Z AMSU 89GHZ MICROWAVE IMAGE INDICATES DEEP CONVECTIVE BANDING HAS FINALLY FORMED OVER THE WESTERN SEMICIRCLE. A FORTUITOUS 301343Z ASCAT-B IMAGE DEPICTS A WELL-DEFINED, SYMMETRIC CIRCULATION WITH 20-25 KNOT WINDS WRAPPING AROUND THE WESTERN SEMICIRCLE INTO THE SOUTHWEST QUADRANT. THERE IS HIGH CONFIDENCE IN THE INITIAL POSITION BASED ON THIS ASCAT IMAGE. DVORAK ESTIMATES FROM KNES AND PGTW RANGE FROM T1.0 TO T1.5, WHICH SUPPORTS THE INITIAL INTENSITY ASSESSMENT OF 25 KNOTS. TD 01W IS FORECAST TO TRACK WEST-NORTHWESTWARD UNDER THE LOW-LEVEL SUBTROPICAL RIDGE POSITIONED TO THE NORTH AND IS EXPECTED TO MAKE LANDFALL JUST PRIOR TO TAU 12 THEN TRACK INLAND WHILE DISSIPATING. NUMERICAL MODEL GUIDANCE SUPPORTS THE JTWC FORECAST TRACK WITH HIGH CONFIDENCE. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 301200Z IS 7 FEET. 2. THIS CANCELS AND SUPERSEDES REF A (WTPN21 PGTW 292130).// NNNN