ABPW10 PGTW 171930 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND /SOUTH PACIFIC OCEANS REISSUED/171930Z-180600ZDEC2020// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/171351ZDEC2020// AMPN/REF A IS A TROPICAL CYCLONE WARNING.// RMKS/ 1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA): A. TROPICAL CYCLONE SUMMARY: NONE. B. TROPICAL DISTURBANCE SUMMARY: (1) AN AREA OF CONVECTION (INVEST 99W) HAS PERSISTED NEAR 6.3N 127.8E, APPROXIMATELY 140 NM EAST-SOUTHEAST OF DAVAO, PHILIPPINES. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY DEPICTS AN EXTENSIVE REGION OF PERSISTENT DEEP CONVECTION SHEARED TO THE NORTH AND WEST OF A BROAD LOW-LEVEL CIRCULATION (LLC). A 171654Z AMSR2 91GHZ COMPOSITE MICROWAVE IMAGE REVEALS A PARTIALLY-EXPOSED LLC WITH CURVED BANDING OVER THE WESTERN SEMICIRCLE. A 171207Z ASCAT-A IMAGE SHOWS AN ELONGATED CIRCULATION WITH 20-25 KNOT WINDS OVER THE NORTHERN AND WESTERN SEMICIRCLES WITH 15-20 KNOT WINDS ELSEWHERE. UPPER-LEVEL ANALYSIS INDICATES A MARGINAL ENVIRONMENT WITH MODERATE TO STRONG EASTERLY VERTICAL WIND SHEAR OFFSET BY STRONG DIFFLUENCE. GLOBAL MODELS INDICATE A WEST-NORTHWESTWARD TRACK OVER MINDANAO WHICH WILL HINDER DEVELOPMENT FOR THE NEXT 36 HOURS, HOWEVER, THE SYSTEM MAY INTENSIFY AFTER TAU 36 AS IT TRACKS OVER THE SULU SEA AND INTERACTS WITH NORTHEAST SURGE FLOW. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1002 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS MEDIUM. (2) NO OTHER SUSPECT AREAS. C. SUBTROPICAL SYSTEM SUMMARY: NONE. 2. SOUTH PACIFIC AREA (WEST COAST OF SOUTH AMERICA TO 135 EAST): A. TROPICAL CYCLONE SUMMARY: (1) AT 17DEC20 1200Z, TROPICAL CYCLONE 05P (YASA) WAS LOCATED NEAR 17.2S 179.9W, APPROXIMATELY 111 NM EAST-NORTHEAST OF SUVA, FIJI, AND HAD TRACKED EAST-SOUTHEASTWARD AT 14 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 115 KNOTS GUSTING TO 140 KNOTS. SEE REF A (WTPS31 PGTW 171500) FOR FURTHER DETAILS. (2) NO OTHER TROPICAL CYCLONES. B. TROPICAL DISTURBANCE SUMMARY: NONE. C. SUBTROPICAL SYSTEM SUMMARY: NONE. 3. JUSTIFICATION FOR REISSUE: ADDED MEDIUM AREA IN PARA. 1.B.(1).// NNNN