ABPW10 PGTW 300600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND
/SOUTH PACIFIC OCEANS/300600Z-310600ZDEC2021//
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 16.6S 146.2E IS NOW LOCATED NEAR 17.2S 147.3E, APPROXIMATELY 91 
NM EAST-SOUTHEAST OF CAIRNS, AUSTRALIA. ANIMATED MULTISPECTRAL 
SATELLITE IMAGERY AND ANIMATED RADAR IMAGERY FROM THE CAIRNS RADAR 
DEPICT A CONSOLIDATING SYSTEM WITH IMPROVED CONVECTIVE BANDING 
WRAPPING INTO A BROAD LOW-LEVEL CIRCULATION CENTER (LLCC). A 300329Z 
AMSR2 89GHZ MICROWAVE IMAGE INDICATES DISORGANIZED LOW-LEVEL BANDING 
WITH A WEAKLY-DEFINED LLCC. THIS SYSTEM IS A HYBRID SYSTEM WITH BOTH 
SUBTROPICAL AND TROPICAL CHARACTERISTICS, AND 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 
DECREASED FROM MODERATE TO LOW (10-15 KNOTS) OVER THE PAST 12 HOURS. 
SEA SURFACE TEMPERATURES ARE CONDUCIVE AT 3031C. ENVIRONMENTAL 
CONDITIONS ARE EXPECTED TO REMAIN MARGINALLYFAVORABLE FOR ABOUT 24 
TO 36 HOURS AS THE SYSTEM TRACKS EASTSOUTHEASTWARD, WHICH MAY ALLOW 
FOR FURTHER CONSOLIDATION. AFTER THIS SHORT WINDOW, THE SYSTEM WILL 
TRACK SOUTHEASTWARD UNDER INCREASING VWS (30-40 KNOTS) WITH SLIGHTLY 
COOLER SST VALUES, AND IS FORECASTED TO TRANSITION TO A SUBTROPICAL 
GALE-FORCE LOW AFTER TAU 48. MAXIMUM SUSTAINED SURFACE WINDS ARE 
ESTIMATED AT 25 TO 30 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED 
TO BE NEAR 1000 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A 
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS HIGH.
      (2) NO OTHER SUSPECT AREAS.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.//
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