WTPN33 PGTW 020300 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL STORM 20W (ROKE) WARNING NR 016// RMKS/ 1. TROPICAL STORM 20W (ROKE) WARNING NR 016 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 020000Z --- NEAR 36.3N 152.5E MOVEMENT PAST SIX HOURS - 065 DEGREES AT 21 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING SUBTROPICAL RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT 035 NM SOUTHEAST QUADRANT 035 NM SOUTHWEST QUADRANT 035 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 105 NM NORTHWEST QUADRANT REPEAT POSIT: 36.3N 152.5E --- FORECASTS: 12 HRS, VALID AT: 021200Z --- 37.1N 155.4E MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL RADIUS OF 050 KT WINDS - 010 NM NORTHEAST QUADRANT 000 NM SOUTHEAST QUADRANT 020 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 250 NM NORTHEAST QUADRANT 080 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 130 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 085 DEG/ 08 KTS --- 24 HRS, VALID AT: 030000Z --- 37.2N 157.4E MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL RADIUS OF 034 KT WINDS - 250 NM NORTHEAST QUADRANT 040 NM SOUTHEAST QUADRANT 110 NM SOUTHWEST QUADRANT 140 NM NORTHWEST QUADRANT --- REMARKS: 020300Z POSITION NEAR 36.5N 153.2E. 02OCT22. TROPICAL STORM 20W (ROKE), LOCATED APPROXIMATELY 585 NM EAST- SOUTHEAST OF MISAWA, JAPAN, HAS TRACKED EAST-NORTHEASTWARD AT 21 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS A RAPIDLY DETERIORATING SYSTEM, WITH A PARTIALLY EXPOSED LOW LEVEL CIRCULATION CENTER (LLCC), RAPIDLY TRANSITING EAST-NORTHEASTWARD ALONG THE NORTHWEST PERIPHERY OF A DEEP SUBTROPICAL RIDGE (STR) TO THE SOUTHEAST. A 012308Z ASCAT INDICATED A HIGHLY ASYMMETRICAL WIND FIELD, WITH WINDS UP TO 55 KNOTS IN THE SOUTHWESTERN QUADRANT OF THE CIRCULATION AND LESS THAN 35 KNOTS IN THE EASTERN QUADRANT. THE INITIAL POSITION AND INTENSITY ARE ASSESSED WITH HIGH CONFIDENCE BASED ON THE SCATTEROMETER DATA. THE JTWC MANUAL AND AUTOMATED PHASE CLASSIFICATION INDICATE THE SYSTEM IS CURRENTLY BECOMING A HYBRID TROPICAL-SUBTROPICAL CYCLONE, WITH CHARACTERISTICS OF BOTH A TROPICAL CYCLONE, SUCH AS A WARM CORE, AND AN EXTRATROPICAL CYCLONE, WITH UPPER-LEVEL TROUGH SUPPORT AND COOL SSTS (24-26C). THE SYSTEM IS RAPIDLY TRANSITIONING HOWEVER, 20W IS EXPECTED TO BECOME FULLY SUBTROPICAL IN THE NEXT 12 HOURS. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WARCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 020000Z IS 25 FEET. // NNNN