WTPS31 PGTW 292100 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL CYCLONE 04P (TUNI) WARNING NR 008// RMKS/ 1. TROPICAL CYCLONE 04P (TUNI) WARNING NR 008 01 ACTIVE TROPICAL CYCLONE IN SOUTHPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 291800Z --- NEAR 17.9S 169.3W MOVEMENT PAST SIX HOURS - 145 DEGREES AT 06 KTS POSITION ACCURATE TO WITHIN 040 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER REPEAT POSIT: 17.9S 169.3W --- FORECASTS: 12 HRS, VALID AT: 300600Z --- 18.9S 169.0W MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 292100Z POSITION NEAR 18.2S 169.2W. TROPICAL CYCLONE (TC) 04P (TUNI), LOCATED APPROXIMATELY 231 NM SOUTH- SOUTHEAST OF PAGO PAGO, AMERICAN SAMOA, HAS TRACKED SOUTHEASTWARD AT 06 KNOTS OVER THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY INDICATES AN ELONGATED, FULLY-EXPOSED LOW-LEVEL CIRCULATION CENTER (LLCC) WITH DEEP CONVECTION SHEARED TO THE SOUTHEAST DUE TO STRONG NORTHWESTERLY VERTICAL WIND SHEAR (VWS). A 291744Z SSMIS 91GHZ IMAGE SHOWS SHALLOW BANDING WRAPPING INTO A DEFINED LLCC WITH DEEP CONVECTION DISPLACED OVER THE SOUTHEAST PERIPHERY OF THE SYSTEM. OVERALL, THERE IS GOOD CONFIDENCE IN THE CURRENT POSITION. A 290833Z ASCAT IMAGE SHOWED 25 TO 30 KNOT WINDS OVER THE NORTHERN SEMI-CIRCLE WITH STRONGER GRADIENT FLOW OF 35 TO 40 KNOTS OVER THE SOUTHERN SEMI-CIRCLE. SURFACE OBSERVATIONS FROM NIUE, 75NM SOUTH-SOUTHWEST OF THE CENTER, CONFIRM SUSTAINED GALE- FORCE SOUTHEASTERLIES AT 27 TO 35 KNOTS. THE CURRENT INTENSITY IS ASSESSED AT 35 KNOTS BASED ON ALL AVAILABLE DATA INCLUDING THE ASCAT DATA, DVORAK CURRENT INTENSITY ESTIMATES AND THE WEAKENED ORGANIZATION. ALTHOUGH TC 04P IS DISSIPATING DUE TO STRONG VWS, COOLER SST AND WEAK INTERACTION WITH THE BAROCLINIC ZONE, THE SYSTEM MAY RE-INTENSIFY AS AN EXTRA-TROPICAL LOW, HOWEVER, THE SYSTEM IS NOT EXPECTED TO REGENERATE AS A WARM-CORE TROPICAL SYSTEM. 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 291800Z IS 14 FEET.//