ABIO10 PGTW 160630
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN OCEAN
/REISSUED/160630Z-161800ZMAY2021//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/160151ZMAY2021//
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:
      (1) AT 16MAY21 0000Z, TROPICAL CYCLONE 01A (TAUKTAE) WAS 
LOCATED NEAR 15.0N 72.9E, APPROXIMATELY 237 NM SOUTH OF MUMBAI, 
INDIA, AND HAD TRACKED NORTH- NORTHWESTWARD AT 06 KNOTS OVER THE 
PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 75 
KNOTS GUSTING TO 90 KNOTS. SEE REF A (WTIO31 PGTW 160300) FOR 
FURTHER DETAILS.
      (2) NO OTHER TROPICAL CYCLONES.
   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:
      (1) AN AREA OF CONVECTION (INVEST 90S) HAS PERSISTED NEAR 5.2S 
76.2E, APPROXIMATELY 257 NM EAST-NORTHEAST OF DIEGO GARCIA. ANIMATED 
MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS A SMALL POCKET OF 
CONVECTION OBSCURING AN ILL-DEFINED LOW LEVEL CIRCULATION (LLC). A 
160403Z METOP-B ASCAT PASS REVEALS AN ELONGATED LLC WITH PRIMARILY 
15-20KT WINDS IN THE SOUTHERN PERIPHERY. A 152339Z SSMIS 91GHZ 
SATELLITE IMAGE REVEALS AN OVERALL LACK OF LOW-LEVEL BANDING 
ASSOCIATED WITH INVEST 90S AND A CONCENTRATION OF CONVECTION TO THE 
SOUTHWEST OF THE LLC. ANALYSIS INDICATES A FAVORABLE ENVIRONMENT FOR 
DEVELOPMENT CHARACTERIZED BY POLEWARD OUTFLOW AND VERY WARM (30-31C) 
SEA SURFACE TEMPERATURES MARGINALLY OFFSET BY LOW TO MODERATE (10-
20KT) VERTICAL WIND SHEAR (VWS). GLOBAL MODELS GENERALLY AGREE THAT 
INVEST 90S WILL PROPAGATE SOUTHWESTWARD WHILE REMAINING ELONGATED 
WITH A MARGINAL STRENGTHENING OF WINDS IN THE SOUTHERN PERIPHERY.  
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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