ABPW10 PGTW 310300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND
/SOUTH PACIFIC OCEANS/REISSUED/310300Z-310600ZDEC2021//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/310221ZDEC2021//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT CANCELLATION.//
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:
      (1) THE AREA OF CONVECTION (INVEST 97S) PREVIOUSLY LOCATED 
NEAR 17.2S 147.3E IS NOW LOCATED NEAR 19.5S 150.2E, APPROXIMATELY 
388 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 GALE-
FORCE LOW AFTER TAU 24. MAXIMUM SUSTAINED SURFACE WINDS ARE 
ESTIMATED AT 25 TO 30 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED 
TO BE NEAR 1000 MB. FOR HAZARDS AND WARNINGS, REFERENCE 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 IS DOWNGRADED TO MEDIUM. SEE REF A (WTPS21 PGTW 310230) FOR 
FURTHER DETAILS.
      (2) NO OTHER SUSPECT AREAS.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.//
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