WTXS51 PGTW 221500 AMD WARNING ATCG MIL 31P SWP 250422142324 2025042212 31P THIRTYONE 018A 01 290 08 SATL 060 T000 100S 1332E 030 T012 093S 1319E 030 AMP 000HR DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER 012HR DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER SUBJ: TROPICAL CYCLONE 31P (THIRTYONE) WARNING NR 018A AMENDED 1. TROPICAL CYCLONE 31P (THIRTYONE) WARNING NR 018A AMENDED 01 ACTIVE TROPICAL CYCLONE IN SOUTHIO MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 221200Z --- NEAR 10.0S 133.2E MOVEMENT PAST SIX HOURS - 290 DEGREES AT 08 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER REPEAT POSIT: 10.0S 133.2E --- FORECASTS: 12 HRS, VALID AT: 230000Z --- 9.3S 131.9E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 221500Z POSITION NEAR 9.8S 132.9E. 22APR25. TROPICAL CYCLONE 31P (THIRTYONE), LOCATED APPROXIMATELY 202 NM NORTHEAST OF DARWIN, AUSTRALIA, HAS TRACKED WEST- NORTHWESTWARD AT 08 KNOTS OVER THE PAST SIX HOURS. AFTER RELEASE OF THE ORIGINAL WARNING NUMBER EIGHTEEN (WR 018), FURTHER SATELLITE ANALYSIS REVEALED SIGNIFICANTLY DECAYED CONVECTIVE STRUCTURE OF THE SYSTEM, WITH SURFACE WINDS BELOW WARNING THRESHOLD. THE PGTW DVORAK ESTIMATE IS NOW 1.5 AND MAJORITY OF THE DETERMINISTIC AND ENSEMBLE GUIDANCE AGREES ON FURTHER DECAY OF TC 31P. 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 221200Z IS 1007 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 221200Z IS 18 FEET. 2. JUSTIFICATION FOR AMENDMENT: FORECAST TRUNCATED TO 12 HOURS AND SYSTEM FINAL WARNED BASED ON 221230Z METOP-B ASCAT PASS AND THE ANIMATED SHORTWAVE INFRARED IMAGERY.// 3125041512 87S1353E 25 3125041518 90S1353E 25 3125041600 96S1350E 25 3125041606 93S1346E 25 3125041612 87S1350E 25 3125041618 89S1362E 25 3125041700 89S1367E 25 3125041706 94S1370E 30 3125041712 97S1379E 30 3125041718 100S1385E 30 3125041800 109S1389E 35 3125041806 112S1397E 35 3125041812 116S1405E 35 3125041818 119S1411E 30 3125041900 122S1413E 30 3125041906 125S1412E 30 3125041912 125S1411E 30 3125041918 124S1411E 30 3125042000 123S1411E 30 3125042006 126S1409E 30 3125042012 126S1402E 30 3125042018 126S1395E 30 3125042100 123S1385E 30 3125042106 120S1374E 35 3125042112 116S1366E 30 3125042118 110S1355E 30 3125042200 106S1346E 30 3125042206 103S1340E 30 3125042212 100S1332E 30 NNNN