ABPW10 PGTW 250600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND
/SOUTH PACIFIC OCEANS/250600Z-260600ZAPR2021//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/241951ZAPR2021//
AMPN/REF A IS A TROPICAL CYCLONE WARNING.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
   A. TROPICAL CYCLONE SUMMARY:
      (1) AT 24APR21 1800Z, SUBTROPICAL STORM 02W (SURIGAE) WAS 
LOCATED NEAR 21.7N 134.1E, APPROXIMATELY 438 NM WEST-SOUTHWEST OF 
IWO TO, JAPAN, AND HAD TRACKED EAST- SOUTHEASTWARD AT 12 KNOTS OVER 
THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED 
AT 40 KNOTS GUSTING TO 50 KNOTS. SEE REF A (WTPN31 PGTW 242100) FOR 
THE FINAL WARNING ON THIS SYSTEM.
      (2) NO OTHER TROPICAL CYCLONES.
   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: NONE.
      (1) THE AREA OF CONVECTION (INVEST 96P) PREVIOUSLY LOCATED 
NEAR 28.7S 142.4W IS NOW LOCATED NEAR 30.6S 142.5W, APPROXIMATELY 
865 NM SOUTH-SOUTHEAST OF PAPEETE, FRENCH POLYNESIA. THE SYSTEM IS 
CURRENTLY CLASSIFIED AS A SUBTROPICAL STORM, GENERALLY CHARACTERIZED 
AS HAVING BOTH TROPICAL AND MIDLATITUDE CYCLONE FEATURES. ANIMATED 
ENHANCED INFRARED SATELLITE IMAGERY AND ANIMATED WATER VAPOR LOOP 
INDICATES THE SYSTEM IS LOCATED DIRECTLY UNDER A BROAD UPPERLEVEL 
COLD CORE LOW. A 250410Z SSMIS 91GHZ IMAGE REVEALS FORMATIVE, SPIRAL 
BANDING WRAPPING INTO A LOW LEVEL CIRCULATION (LLC) WITH CYCLING 
CONVECTION IN THE SOUTHERN SEMICIRCLE. ENVIRONMENTAL ANALYSIS FOR 
INVEST 96P INDICATES A HOSTILE ENVIRONMENT, NOT CONDUCIVE FOR 
TROPICAL DEVELOPMENT DUE TO CONVERGENCE ALOFT AND COOL (23-24 
CELSIUS) SEA SURFACE TEMPERATURES. GLOBAL MODELS SHOW A GENERAL 
SOUTHWARD TRACK WITH MINIMAL INTENSIFICATION OVER THE NEXT 24-36 
HOURS. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 30 TO 35 
KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 996 MB. 
THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE 
WITHIN THE NEXT 24 HOURS REMAINS LOW.
      (2) NO OTHER SUSPECT AREAS.//
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