ABPW10 PGTW 310600 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND /SOUTH PACIFIC OCEANS/310600ZDEC2021-010600ZJAN2022// RMKS/ 1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA): A. TROPICAL CYCLONE SUMMARY: NONE. B. TROPICAL DISTURBANCE SUMMARY: NONE. C. SUBTROPICAL SYSTEM SUMMARY: NONE. 2. SOUTH PACIFIC AREA (WEST COAST OF SOUTH AMERICA TO 135 EAST): A. TROPICAL CYCLONE SUMMARY: NONE. B. TROPICAL DISTURBANCE SUMMARY: NONE. C. SUBTROPICAL SYSTEM SUMMARY: (1) THE AREA OF CONVECTION (INVEST 97S) PREVIOUSLY LOCATED NEAR 18.4S 151.3E IS NOW LOCATED NEAR 19.2S 152.4E, APPROXIMATELY 403 NM EAST-SOUTHEAST OF CAIRNS, AUSTRALIA. THE SYSTEM IS CURRENTLY CLASSIFIED AS A SUBTROPICAL STORM, GENERALLY CHARACTERIZED AS HAVING BOTH TROPICAL AND MID-LATITUDE CYCLONE FEATURES. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND ANIMATED RADAR IMAGERY FROM THE CAIRNS RADAR DEPICT A CONSOLIDATING SYSTEM WITH CONVECTIVE BANDING WRAPPING INTO A BROAD LOW-LEVEL CIRCULATION CENTER (LLCC). A 302031Z SSMIS 91GHZ MICROWAVE IMAGE INDICATES DISORGANIZED LOW-LEVEL BANDING WITH A WEAKLY-DEFINED LLCC. THIS SYSTEM IS LOCATED JUST NORTH OF A SUBTROPICAL JET. UPPER-LEVEL FEATURE TRACK WINDS INDICATE A DEVELOPING ANTICYCLONE OVER THE SYSTEM WITH IMPROVED EQUATORWARD AND POLEWARD OUTFLOW. ADDITIONALLY, VERTICAL WIND SHEAR (VWS) HAS REMAINED MODERATE TO LOW (10-15 KTS). SEA SURFACE TEMPERATURES ARE CONDUCIVE AT 29-30C. GLOBAL MODELS INDICATE THE SYSTEM WILL TRACK SOUTHEASTWARD UNDER INCREASING VWS (40-50 KTS) WITH SLIGHTLY COOLER SST VALUES, AND IS FORECASTED TO TRANSITION TO A SUBTROPICAL GALEFORCE LOW AFTER TAU 24. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 35 TO 40 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 994 MB. FOR HAZARDS AND WARNINGS, REFERENCE THE FLEET WEATHER CENTER SAN DIEGO HIGH WINDS AND SEAS PRODUCT OR REFER TO LOCAL WMO DESIGNATED FORECAST AUTHORITY. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS MEDIUM. (2) NO OTHER SUBTROPICAL SYSTEMS.// NNNN