WTPN31 PGTW 171500 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL CYCLONE WARNING// RMKS/ 1. TROPICAL DEPRESSION 03W (THREE) WARNING NR 002 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 171200Z --- NEAR 21.5N 129.4E MOVEMENT PAST SIX HOURS - 345 DEGREES AT 12 KTS POSITION ACCURATE TO WITHIN 030 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER REPEAT POSIT: 21.5N 129.4E --- FORECASTS: 12 HRS, VALID AT: 180000Z --- 23.5N 128.7E MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 24 HR POSIT: 330 DEG/ 11 KTS --- 24 HRS, VALID AT: 181200Z --- 25.4N 127.5E MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 171500Z POSITION NEAR 22.0N 129.2E. TROPICAL DEPRESSION 03W (THREE), LOCATED APPROXIMATELY 313 NM SOUTH-SOUTHEAST OF KADENA AB, HAS TRACKED NORTH-NORTHWESTWARD AT 12 KNOTS OVER THE PAST SIX HOURS. THE CURRENT POSITION IS BASED ON A RECENT PGTW SATELLITE FIX ON A PARTIALLY-EXPOSED LOW-LEVEL CIRCULATION CENTER AND ON A 170939Z SSMIS IMAGE. THE INTENSITY ESTIMATE OF 25 KNOTS IS CONSISTENT WITH RECENT SUBJECTIVE DVORAK ESTIMATES AND STRUCTURE EVIDENT IN MICROWAVE SATELLITE IMAGERY. TD 03W IS TRACKING POLEWARD ALONG THE WESTERN PERIPHERY OF A SUBTROPICAL STEERING RIDGE INTO AN AREA OF INCREASING EASTERLY VERTICAL WIND SHEAR. IN RESPONSE TO THIS PERSISTENT SHEAR, TD 03W IS EXPECTED TO STEADILY DISSIPATE BELOW THE WARNING THRESHOLD INTENSITY OF 25 KNOTS OVER THE NEXT 12 HOURS. THEREFORE, 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 171200Z IS 9 FEET.//