ABIO10 PGTW 031100
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN OCEAN
/REISSUED/031100Z-031800ZMAR2021//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/030152ZMAR2021//
AMPN/REF A IS A TROPICAL CYCLONE WARNING.//
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:
      (1) AT 03MAR21 0000Z, TROPICAL CYCLONE 22S (MARIAN) WAS 
LOCATED NEAR 18.9S 90.9E, APPROXIMATELY 1317 NM WEST OF LEARMONTH, 
AUSTRALIA, AND HAD TRACKED EAST-SOUTHEASTWARD AT 04 KNOTS OVER THE 
PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 80 
KNOTS GUSTING TO 100 KNOTS. SEE REF A (WTXS31 PGTW 030300) FOR 
FURTHER DETAILS.
      (2) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) AN AREA OF CONVECTION (INVEST 90S) HAS PERSISTED NEAR 
15.2S 65.6E, APPROXIMATELY 545 NM EAST-NORTHEAST OF MAURITIUS. 
ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS FORMATIVE 
CONVECTIVE BANDING BEGINNING TO WRAP INTO AN OBSCURED LOW LEVEL 
CIRCULATION CENTER (LLCC). A 031011Z ASCAT-B PASS REVEALS A RAGGED 
AND ELONGATED CIRCULATION WITH 15-2OKT WINDS NEAR THE CENTER AND A 
SWATH OF 25-30KT WINDS ALONG THE NORTHERN PERIPHERY. INVEST 90S IS 
IN A FAVORABLE ENVIRONMENT FOR DEVELOPMENT CHARACTERIZED BY 
EQUATORWARD OUTFLOW ALOFT, LOW TO MODERATE (10-20KT) VERTICAL WIND 
SHEAR (VWS) AND VERY WARM (30-31C) SEA SURFACE TEMPERATURES (SST). 
GLOBAL MODELS GENERALLY AGREE THAT 90S WILL TRACK EAST-SOUTHEAST AS 
IT CONSOLIDATES AND STRENGTHENS.  MAXIMUM SUSTAINED SURFACE WINDS 
ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS 
ESTIMATED TO BE NEAR 1003 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A 
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS LOW.
      (2) NO OTHER SUSPECT AREAS.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.
3. JUSTIFICATION FOR REISSUE: ADDED AREA IN PARA 2.B.(1) AS LOW.//
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