ABIO10 PGTW 270300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN
/OCEAN REISSUED/270300Z-271800ZDEC2020//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/261951ZDEC2020//
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 26DEC20 1800Z, TROPICAL CYCLONE 07S (CHALANE) WAS 
LOCATED NEAR 17.6S 49.7E, APPROXIMATELY 148 NM EAST-NORTHEAST OF 
ANTANANARIVO, MADAGASCAR, AND HAD TRACKED SOUTHWESTWARD AT 15 KNOTS 
(KTS) OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE 
ESTIMATED AT 35 KNOTS GUSTING TO 45 KNOTS. SEE REF A (WTXS31 PGTW 
262100) FOR FURTHER DETAILS.
      (2) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) AN AREA OF CONVECTION (INVEST 93S) HAS PERSISTED NEAR 
10.9S 92.4E, APPROXIMATELY 270 NM WEST-NORTHWEST OF COCOS ISLANDS. 
ANIMATED ENHANCED INFRARED SATELLITE IMAGERY AND A 262211Z 91GHZ 
SSMIS IMAGE DEPICT A WEAK CIRCULATION WITH SOME SHEARED CONVECTION 
OFFSET TO THE WEST OF THE LOW LEVEL CIRCULATION. INVEST 93S IS 
CURRENTLY IN A MARGINALLY FAVORABLE ENVIRONMENT FOR DEVELOPMENT WITH 
WARM (29-30C) SEA SURFACE TEMPERATURES, GOOD POLEWARD OUTFLOW ALOFT, 
AND MODERATE TO STRONG (15-25 KNOTS) VERTICAL WIND SHEAR. GLOBAL 
MODELS ARE IN GENERAL AGREEMENT THAT INVEST 93S WILL TRACK GENERALLY 
WESTWARD WITH LITTLE TO NO INTENSIFICATION OVER THE NEXT 24 HOURS. 
MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 20 TO 25 KNOTS. 
MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1004 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 LOW AREA IN PARA. 2.B.(1).//
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