WARNING ATCG MIL 12W NWP 200912014803 2020091200 12W TWELVE 002 01 015 06 SATL 030 T000 315N 1384E 025 T012 336N 1399E 025 T024 357N 1426E 025 AMP 000HR BECOMING EXTRATROPICAL 012HR EXTRATROPICAL 024HR EXTRATROPICAL SUBJ: TROPICAL DEPRESSION 12W (TWELVE) WARNING NR 002 1. TROPICAL DEPRESSION 12W (TWELVE) 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: 120000Z --- NEAR 31.5N 138.4E MOVEMENT PAST SIX HOURS - 015 DEGREES AT 06 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 BECOMING EXTRATROPICAL REPEAT POSIT: 31.5N 138.4E --- FORECASTS: 12 HRS, VALID AT: 121200Z --- 33.6N 139.9E MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL VECTOR TO 24 HR POSIT: 045 DEG/ 15 KTS --- 24 HRS, VALID AT: 130000Z --- 35.7N 142.6E MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 120300Z POSITION NEAR 32.0N 138.8E. 12SEP20. TROPICAL DEPRESSION 12W (TWELVE), LOCATED APPROXIMATELY 237 NM SOUTH-SOUTHWEST OF YOKOSUKA, JAPAN, HAS TRACKED NORTH- NORTHEASTWARD AT 06 KNOTS OVER THE PAST SIX HOURS. ANMIATED MULTISPECTRAL SATELLITE IMAGERY (MSI) INDICATES THAT THE IMPROVING CONVECTIVE ORGANIZATION OBSERVED SIX HOURS AGO HAS SUCCUMBED TO THE HIGH (20 KNOT) VERTICAL WIND SHEAR (VWS), LEAVING BEHIND A WEAK, EXPOSED LOW LEVEL CIRCULATION CENTER (LLCC). THE INITIAL POSITION IS BASED ON THE LLCC IN MSI WITH HIGH CONFIDENCE. A 112304Z ASCAT-A PASS RELEAVED ONLY A FEW ISOLATED 25 TO 30 KNOT WIND BARBS UNDER DEEP CONVECTION, AND DISPLACED 75 NM FROM THE LLCC. THE INITIAL INTENSITY IS ASSESSED AT 25 KNOTS BASED ON THESE ISOLATED ASCAT WINDS AND AGENCY DVORAK ESTIMATES, HOWEVER, THE EXPOSED LLCC IS GENERALLY CHARACTIZED BY ONLY 10-15 KNOT WINDS. 12W IS CLEARLY INTERACTING WITH MID-LATITUDE WESTERLIES AND IS TAKING ON EXTRA- TROPICAL CHARACTERISTICS. EXTRA-TROPICAL TRANSITION IS EXPECTED TO BE COMPLETED WITHIN 12 HOURS, CONSISTENT WITH FSU PHASE SPACE GUIDANCE. DYNAMIC GUIDANCE IS GOOD AGREEMENT FOR THIS SHORT FORECAST. JTWC FORECAST CONFIDENCE IS ASSESSED AS HIGH. 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 120000Z IS 9 FEET. // 1220090912 238N1436E 15 1220090918 239N1433E 15 1220091000 242N1428E 15 1220091006 250N1422E 20 1220091012 255N1411E 20 1220091018 274N1403E 20 1220091100 279N1400E 20 1220091106 285N1396E 20 1220091112 296N1388E 20 1220091118 309N1382E 25 1220091200 315N1384E 25 NNNN NNNN