WTPN31 PGTW 202100 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL STORM 28W (RAI) WARNING NR 032// RMKS/ 1. TROPICAL STORM 28W (RAI) WARNING NR 032 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 201800Z --- NEAR 19.8N 113.0E MOVEMENT PAST SIX HOURS - 045 DEGREES AT 11 KTS POSITION ACCURATE TO WITHIN 020 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING SUBTROPICAL RADIUS OF 034 KT WINDS - 045 NM NORTHEAST QUADRANT 055 NM SOUTHEAST QUADRANT 055 NM SOUTHWEST QUADRANT 055 NM NORTHWEST QUADRANT REPEAT POSIT: 19.8N 113.0E --- FORECASTS: 12 HRS, VALID AT: 210600Z --- 21.1N 115.2E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL VECTOR TO 24 HR POSIT: 075 DEG/ 14 KTS --- 24 HRS, VALID AT: 211800Z --- 21.9N 118.1E MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL --- REMARKS: 202100Z POSITION NEAR 20.1N 113.5E. 20DEC21. TROPICAL STORM 28W (RAI), LOCATED APPROXIMATELY 164 NM SOUTH-SOUTHWEST OF HONG KONG, HAS TRACKED NORTHEASTWARD AT 11 KNOTS OVER THE PAST SIX HOURS. THE CIRCULATION HAS LOST ALL CONVECTION AS IT TRANSLATES OVER COOLER SEA SURFACE TEMPERATURES OF 23-24 DEGREES CELSIUS. THE SYSTEM IS THUS EXPECTED TO IMMINENTLY BECOME SUBTROPICAL AS THE CIRCULATION GRADUALLY SPINS DOWN OVER THE NEXT 12-24 HOURS. 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 201800Z IS 15 FEET.// NNNN