WTPN31 PGTW 060300 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TYPHOON 12W (HINNAMNOR) WARNING NR 036// RMKS/ 1. TYPHOON 12W (HINNAMNOR) WARNING NR 036 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 060000Z --- NEAR 36.5N 130.6E MOVEMENT PAST SIX HOURS - 045 DEGREES AT 31 KTS POSITION ACCURATE TO WITHIN 030 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE, RADAR AND SYNOPTIC DATA PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 075 KT, GUSTS 090 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING EXTRATROPICAL RADIUS OF 064 KT WINDS - 050 NM NORTHEAST QUADRANT 050 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 050 KT WINDS - 090 NM NORTHEAST QUADRANT 095 NM SOUTHEAST QUADRANT 090 NM SOUTHWEST QUADRANT 045 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 165 NM NORTHEAST QUADRANT 170 NM SOUTHEAST QUADRANT 165 NM SOUTHWEST QUADRANT 090 NM NORTHWEST QUADRANT REPEAT POSIT: 36.5N 130.6E --- FORECASTS: 12 HRS, VALID AT: 061200Z --- 43.0N 135.8E MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL RADIUS OF 050 KT WINDS - 060 NM NORTHEAST QUADRANT 100 NM SOUTHEAST QUADRANT 040 NM SOUTHWEST QUADRANT 020 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 170 NM NORTHEAST QUADRANT 220 NM SOUTHEAST QUADRANT 170 NM SOUTHWEST QUADRANT 080 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 020 DEG/ 37 KTS --- 24 HRS, VALID AT: 070000Z --- 49.9N 139.9E MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT 090 NM SOUTHEAST QUADRANT 010 NM SOUTHWEST QUADRANT 000 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 190 NM NORTHEAST QUADRANT 240 NM SOUTHEAST QUADRANT 170 NM SOUTHWEST QUADRANT 110 NM NORTHWEST QUADRANT --- REMARKS: 060300Z POSITION NEAR 38.1N 131.9E. 06SEP22. TYPHOON (TY) 12W (HINNAMNOR), LOCATED APPROXIMATELY 111 NM NORTHEAST OF BUSAN, SOUTH KOREA, HAS TRACKED NORTHEASTWARD AT 31 KNOTS OVER THE PAST SIX HOURS. TY 12W IS EMBEDDED WITHIN A STRONG MIDLATITUDE SHORTWAVE TROUGH WITH WEAK FRONTAL STRUCTURE, AND HAS COMMENCED EXTRA-TROPICAL TRANSITION. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY INDICATES ASYMMETRIC CONVECTION OBSCURING THE LOW- LEVEL CIRCULATION CENTER (LLCC) WITH THE BULK OF THE DEEP CONVECTION SHEARING POLEWARD DUE TO STRONG SOUTHERLY VERTICAL WIND SHEAR (VWS). A 060035Z AMSU-B 89GHZ MICROWAVE IMAGE INDICATES THE SYSTEM HAS MAINTAINED A DEFINED LLCC WITH LIMITED CURVED BANDING, HOWEVER, A DELTA RAIN REGION IS EVIDENT OVER THE NORTHERN QUADRANT. BASED ON THE DEFINED LLCC, RJTD RADAR FIX AND A 060036Z ASCAT AMBIGUITY IMAGE, THERE IS HIGH CONFIDENCE IN THE INITIAL POSITION. THE INITIAL INTENSITY IS ASSESSED AT 75 KNOTS PRIMARILY BASED ON A 052124Z RADARSAT2 SAR PASS SHOWING A SWATH OF 70-78 KNOT WINDS OVER THE EAST AND SOUTHEAST QUADRANTS. DVORAK CURRENT INTENSITY ESTIMATES OF 4.5 (77 KNOTS) FROM RJTD AND PGTW ALSO SUPPORT THE ASSESSMENT. ALTHOUGH NOT OVERLY IMPRESSIVE, SURFACE OBSERVATIONS FROM BUSAN AROUND 051900- 2100Z, INDICATED MAXIMUM WINDS OF 35 KNOTS GUSTING TO 64 KNOTS AND MINIMUM SLP NEAR 967MB, WHICH CORRESPONDS TO A 75 KNOT SYSTEM. TY 12W IS FORECAST TO RAPIDLY TRANSITION INTO A STRONG EXTRA-TROPICAL, COLD- CORE LOW BY TAU 12 AS IT GAINS FRONTAL CHARACTERISTICS AND APPROACHES THE MIDLATITUDE JET WITH VERY HIGH VWS (40-50 KNOTS). 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 060000Z IS 27 FEET.// NNNN