ABPW10 PGTW 210600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH 
PACIFIC OCEANS 210600Z-220600ZDEC2021//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/201951ZDEC2021//
AMPN/REF A IS A TROPICAL CYCLONE FINAL WARNING.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY:
      (1) AT 20DEC21 1800Z, TROPICAL STORM 28W (RAI) WAS LOCATED 
NEAR 19.8N 113.0E, APPROXIMATELY 164 NM SOUTH-SOUTHWEST OF HONG 
KONG, AND HAD TRACKED NORTHEASTWARD AT 11 KNOTS OVER THE PAST SIX 
HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 40 KNOTS 
GUSTING TO 50 KNOTS. SEE REF A (WTPN31 PGTW 202100) FOR THE FINAL 
WARNING ON THIS SYSTEM.
      (2) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) THE AREA OF CONVECTION (INVEST 98W) PREVIOUSLY LOCATED 
NEAR 6.4N 140.7E IS NOW LOCATED NEAR 6.7N 140.4E, APPROXIMATELY 348 
NM EAST OF PALAU. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) AND 
A 210342Z AMSR2 89GHZ MICROWAVE IMAGE DEPICT FLARING CONVECTION OVER 
A BROAD LOW LEVEL CIRCULATION. ENVIRONMENTAL ANALYSIS DEPICTS 
GENERALLY FAVORABLE CONDITIONS FOR DEVELOPMENT WITH ROBUST 
EQUATORWARD OUTFLOW, LOW (5-10 KTS) VERTICAL WIND SHEAR (VWS), AND 
WARM (29-30C) SEA SURFACE TEMPERATURES. GLOBAL MODELS INDICATE THAT 
98W WILL TRACK WEST-NORTHWESTWARD, AND ARE SPLIT ON DEVELOPMENT, 
WITH THE GFS CONTINUING TO BE THE MOST AGGRESSIVE. MAXIMUM SUSTAINED 
SURFACE WINDS ARE ESTIMATED AT 18 TO 23 KNOTS. MINIMUM SEA LEVEL 
PRESSURE IS ESTIMATED TO BE NEAR 1007 MB. THE POTENTIAL FOR THE 
DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 
HOURS REMAINS LOW.
      (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: NONE.
   B. TROPICAL DISTURBANCE SUMMARY: NONE.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.
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