ABIO10 PGTW 121800
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN OCEAN
/121800-131800ZAPR2022//
RMKS/
1. NORTH INDIAN OCEAN AREA (MALAY PENINSULA WEST TO COAST OF AFRICA):
   A. TROPICAL CYCLONE SUMMARY: NONE.
   B. TROPICAL DISTURBANCE SUMMARY: NONE.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.
2. SOUTH INDIAN OCEAN AREA (135E WEST TO COAST OF AFRICA):
   A. TROPICAL CYCLONE SUMMARY: NONE.
   B. TROPICAL DISTURBANCE SUMMARY: NONE.
   C. SUBTROPICAL SYSTEM SUMMARY:
      (1) THE AREA OF CONVECTION (INVEST 92S) PREVIOUSLY LOCATED 
NEAR 31.0S 31.0E IS NOW LOCATED NEAR 31.4S 31.2E, APPROXIMATELY 193 
NM EAST-NORTHEAST OF EAST LONDON, SOUTH AFRICA. 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 A 121635Z SSMIS 91GHZ COLOR 
COMPOSITE MICROWAVE IMAGE DEPICT IMPROVED CORE CONVECTION WITH 
TIGHTLY CURVED BANDING WRAPPING INTO A BANDING EYE. A 120737Z ASCAT-
C IMAGE REVEALS A SYMMETRIC CIRCULATION WITH 35-40 KT WINDS. THE 
SYSTEM DEVELOPED PRIMARILY OVER LAND WITH STRONG BAROCLINIC FEATURES 
BUT HAS SINCE MOVED OFFSHORE. THE LLCC REMAINS VERTICALLY STACKED 
WITH A 500MB LOW HEIGHT CENTER WITH WEAK THERMAL ADVECTION AND A MID-
LEVEL WARM CORE. THIS SYSTEM IS LOCATED UNDER AN UPPER-LEVEL LOW 
WITH POLEWARD VENTING INTO A JET TO THE SOUTH BUT IS LOCATED OVER 
COOL (24-25C) SEA SURFACE TEMPERATURES (SSTS). GLOBAL MODELS 
INDICATE INVEST 92S WILL TRACK SOUTHEAST OVER THE NEXT 72 HOURS 
WHILE STEADILY WEAKENING, UNDERGOING EXTRATROPICAL TRANSITION AND 
BECOMING EMBEDDED UNDER A MIDLATITUDE TROUGH. MAXIMUM SUSTAINED 
SURFACE WINDS ARE ESTIMATED AT 35 TO 40 KNOTS. MINIMUM SEA LEVEL 
PRESSURE IS ESTIMATED TO BE NEAR 993MB. 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 LOW.
      (2) NO OTHER SUBTROPICAL SYSTEMS.
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