SUBJ: TROPICAL STORM 27W (KOGUMA) WARNING NR 036 WTPN33 PGTW 132100 1. TROPICAL STORM 27W (KOGUMA) WARNING NR 036 02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 131800Z --- NEAR 38.3N 157.2E MOVEMENT PAST SIX HOURS - 045 DEGREES AT 20 KTS POSITION ACCURATE TO WITHIN 030 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT WIND RADII VALID OVER OPEN WATER ONLY BECOMING SUBTROPICAL RADIUS OF 050 KT WINDS - 070 NM NORTHEAST QUADRANT 070 NM SOUTHEAST QUADRANT 070 NM SOUTHWEST QUADRANT 050 NM NORTHWEST QUADRANT RADIUS OF 034 KT WINDS - 140 NM NORTHEAST QUADRANT 160 NM SOUTHEAST QUADRANT 100 NM SOUTHWEST QUADRANT 095 NM NORTHWEST QUADRANT REPEAT POSIT: 38.3N 157.2E --- FORECASTS: 12 HRS, VALID AT: 140600Z --- 40.6N 160.9E MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL RADIUS OF 034 KT WINDS - 190 NM NORTHEAST QUADRANT 190 NM SOUTHEAST QUADRANT 140 NM SOUTHWEST QUADRANT 100 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 065 DEG/ 18 KTS --- 24 HRS, VALID AT: 141800Z --- 42.0N 165.3E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY SUBTROPICAL RADIUS OF 034 KT WINDS - 220 NM NORTHEAST QUADRANT 195 NM SOUTHEAST QUADRANT 180 NM SOUTHWEST QUADRANT 060 NM NORTHWEST QUADRANT --- REMARKS: 132100Z POSITION NEAR 38.9N 158.1E. 13OCT26. TROPICAL STORM 27W (KOGUMA), LOCATED APPROXIMATELY 752 NM EAST OF MISAWA, JAPAN, HAS TRACKED NORTHEASTWARD AT 20 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED IMAGERY (EIR) SHOWS 27W WITH AN INCREASINGLY ASYMMETRICAL STRUCTURE AND LOSS OF CENTRAL CONVECTION. FURTHER ANALYSIS REVEALS 27W HAS LOST TROPICAL CHARACTERISTICS WITH AN ASYMMETRICAL WIND FIELD AND CONVECTIVE STRUCTURE AS WELL AS EXPANDING RADIUS OF MAXIMUM WINDS (RMW). ADDITIONALLY, THE SYSTEM IS CURRENTLY WITHIN LESS THAN 24 C SEA SURFACE TEMPERATURES AND 30-40 KTS OF VERTICAL WIND SHEAR WHICH CONTINUES TO ENTRAIN DRY AIR INTO THE CORE. THE SYSTEM IS ASSESSED TO HAVE BEGUN SUBTROPICAL TRANSITION (STT) AND IS EXPECTED TO COMPLETE WITHIN 12 HOURS, WITH LIKELY SUBSEQUENT EXTRATROPICAL TRANSITION (ETT) AS THE SYSTEM NEARS THE UPPER LEVEL JET AND STRONGER BAROCLINIC ZONE. THE SYSTEM IS EXPECTED TO STEADILY WEAKEN AS IT TRANSITIONS DUE TO THE HOSTILE ENVIRONMENTAL CONDITIONS. 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. MINIMUM CENTRAL PRESSURE AT 131800Z IS 988MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 131800Z IS 24 FEET.REFER TO TROPICAL DEPRESSION 28W (TWENTYEIGHT) WARNINGS (WTPN31 PGTW) FOR SIX-HOURLY UPDATES. // BT #0001 NNNN