WTPS32 PGTW 132100 MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC// SUBJ/TROPICAL CYCLONE 20P (JONI) WARNING NR 006// RMKS/ 1. TROPICAL CYCLONE 20P (JONI) WARNING NR 006 01 ACTIVE TROPICAL CYCLONE IN SOUTHPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 131800Z --- NEAR 31.4S 159.0W MOVEMENT PAST SIX HOURS - 175 DEGREES AT 19 KTS POSITION ACCURATE TO WITHIN 060 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: 31.4S 159.0W --- FORECASTS: 12 HRS, VALID AT: 140600Z --- 35.5S 157.3W MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER VECTOR TO 24 HR POSIT: 135 DEG/ 23 KTS --- 24 HRS, VALID AT: 141800Z --- 38.7S 153.1W MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 132100Z POSITION NEAR 32.4S 158.6W. TROPICAL CYCLONE (TC) 20P (JONI), LOCATED APPROXIMATELY 336 NM SOUTH OF RAROTONGA, HAS TRACKED RAPIDLY SOUTHWARD AT 19 KNOTS OVER THE PAST SIX HOURS. ANIMATED WATER VAPOR IMAGERY SHOWS OUTFLOW OVER THE SYSTEM HAS SIGNIFICANTLY DIMINISHED AS THE UPPER LEVEL CYCLONE TO THE EAST, PREVIOUSLY AIDING WITH DIFFLUENCE, HAS CLOSED IN AND PINCHED THE OUTFLOW CHANNEL. CONVECTION AROUND THE LOW LEVEL CIRCULATION CENTER IS GREATLY REDUCED AND HAS BECOME ASYMMETRICAL. UPPER LEVEL ANALYSIS INDICATES TC 20P IS FAST APPROACHING THE BAROCLINIC ZONE AND VERTICAL WIND SHEAR HAS INCREASED TO 30-40 KNOTS. THE SYSTEM IS EXPECTED TO QUICKLY DISSIPATE OVER THE NEXT 24 HOURS. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WARNING CENTER (NAVMARFCSTCEN). THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 131800Z IS 12 FEET.//