WTPN33 PGTW 180300 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL CYCLONE WARNING// RMKS/ 1. TROPICAL DEPRESSION 11W (NANGKA) WARNING NR 059 02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 180000Z --- NEAR 38.6N 135.4E MOVEMENT PAST SIX HOURS - 025 DEGREES AT 10 KTS POSITION ACCURATE TO WITHIN 045 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 DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER REPEAT POSIT: 38.6N 135.4E --- FORECASTS: 12 HRS, VALID AT: 181200Z --- 40.6N 138.0E MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 24 HR POSIT: 065 DEG/ 15 KTS --- 24 HRS, VALID AT: 190000Z --- 41.7N 141.6E MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 180300Z POSITION NEAR 39.1N 136.1E. TROPICAL DEPRESSION (TD) 11W (NANGKA), LOCATED APPROXIMATELY 289 NM WEST-SOUTHWEST OF MISAWA, JAPAN, HAS TRACKED NORTH-NORTHEASTWARD AT 10 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS A FULLY-EXPOSED, BROAD LOW-LEVEL CIRCULATION CENTER (LLCC) WITH NO DEEP CONVECTION. A 172324Z SSMIS 37 GHZ IMAGE DEPICTS DEFINED, SHALLOW BANDING WRAPPING BROADLY INTO THE CENTER. BASED ON THIS IMAGERY, THERE IS FAIR CONFIDENCE IN THE CURRENT POSITION. THE INITIAL INTENSITY IS ASSESSED AT 25 KNOTS BASED ON RECENT SCATTEROMETER DATA AND DVORAK CURRENT INTENSITY ESTIMATES RANGING FROM 25 TO 30 KNOTS. UPPER-LEVEL ANALYSIS INDICATES THAT THE SYSTEM IS EMBEDDED WITHIN SUBTROPICAL SOUTHWESTERLY FLOW WITH MODERATE VERTICAL WIND SHEAR. TD 11W IS CURRENTLY TRACKING ALONG THE NORTHWESTERN PERIPHERY OF THE STR. CURRENTLY, THE BAROCLINIC ZONE IS WEAK AND IS DISPLACED WELL TO THE NORTH, THEREFORE, THE SYSTEM IS NOT UNDERGOING EXTRA-TROPICAL TRANSITION (ETT). TD NANGKA WILL CONTINUE TRACKING NORTHEASTWARD THROUGH THE FORECAST PERIOD AS IT CONTINUES TO TRACK WITHIN VIGOROUS SUBTROPICAL SOUTHWESTERLY FLOW, POLEWARD OF THE STR. DYNAMIC GUIDANCE IS IN GOOD AGREEMENT AND SUPPORTS THE FORECAST TRACK WITH HIGH CONFIDENCE. TD 11W IS FORECAST TO DISSIPATE BY TAU 12. 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 180000Z IS 10 FEET. REFER TO TROPICAL STORM 01C (HALOLA) WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES.//