WTPN31 PGTW 170300 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL STORM 07W (LAN) WARNING NR 038// RMKS/ 1. TROPICAL STORM 07W (LAN) WARNING NR 038 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 170000Z --- NEAR 44.0N 138.7E MOVEMENT PAST SIX HOURS - 030 DEGREES AT 20 KTS POSITION ACCURATE TO WITHIN 045 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 EXTRATROPICAL RADIUS OF 034 KT WINDS - 075 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 075 NM NORTHWEST QUADRANT REPEAT POSIT: 44.0N 138.7E --- FORECASTS: 12 HRS, VALID AT: 171200Z --- 46.4N 142.3E MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL RADIUS OF 034 KT WINDS - 075 NM NORTHEAST QUADRANT 065 NM SOUTHEAST QUADRANT 050 NM SOUTHWEST QUADRANT 075 NM NORTHWEST QUADRANT VECTOR TO 24 HR POSIT: 065 DEG/ 19 KTS --- 24 HRS, VALID AT: 180000Z --- 48.0N 147.4E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY EXTRATROPICAL --- REMARKS: 170300Z POSITION NEAR 44.6N 139.6E. 17AUG23. TROPICAL STORM (TS) 07W (LAN), LOCATED APPROXIMATELY 243 NM NORTH-NORTHWEST OF MISAWA, JAPAN, HAS TRACKED NORTH-NORTHEASTWARD AT 20 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND A 162120Z SSMIS 91 GHZ MICROWAVE IMAGE DEPICT A BROAD LOW-LEVEL CIRCULATION WITH DEEP CONVECTION SHEARED OVER THE NORTHWEST PERIPHERY DUE TO STRONG (30 KNOTS) SOUTHWESTERLY VERTICAL WIND SHEAR. TS 07W IS TRACKING UNDER STRONG MIDLATITUDE SOUTHWESTERLY FLOW AND OVER COOL SST (22 CELSIUS) WHILE UNDERGOING EXTRA-TROPICAL TRANSITION (ETT). THE SYSTEM IS FORECAST TO WEAKEN GRADUALLY AS IT TRACKS NORTHEASTWARD TO EAST-NORTHEASTWARD THROUGH TAU 24 WITH DECREASING SST (15 TO 16 DEGREES CELSIUS BY TAU 24), INCREASING VERTICAL WIND SHEAR, AND SIGNIFICANT DRY AIR. TS 07W WILL COMPLETE ETT BY TAU 24 NEAR THE SOUTHERN TIP OF SAKHALIN ISLAND. OVERALL, THERE IS HIGH CONFIDENCE IN THE JTWC TRACK AND INTENSITY FORECASTS. 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 170000Z IS 985 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 170000Z IS 22 FEET.// NNNN