ABIO10 PGTW 310030
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN OCEAN 
REISSUED/310030ZDEC2025-311800ZJAN2026//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/301351ZDEC2025//
REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/301952ZDEC2025//
NARR/REF A IS A TROPICAL CYCLONE WARNING. REF B IS A TROPICAL CYCLONE 
FINAL 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 30DEC25 1200Z, TROPICAL CYCLONE 09S (GRANT) WAS LOCATED 
NEAR 14.7S 75.6E, APPROXIMATELY 491 NM SOUTH-SOUTHEAST OF DIEGO 
GARCIA, AND HAD TRACKED WEST- SOUTHWESTWARD AT 14 KNOTS OVER THE PAST 
SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 120 KNOTS 
GUSTING TO 145 KNOTS. SEE REF A (WTXS32 PGTW 301500) FOR FURTHER 
DETAILS.
      (2) AT 30DEC25 1800Z, TROPICAL CYCLONE 10S (HAYLEY) WAS LOCATED 
NEAR 16.8S 124.3E, APPROXIMATELY 137 NM EAST-NORTHEAST OF BROOME, 
AUSTRALIA, AND HAD TRACKED EASTWARD AT 11 KNOTS OVER THE PAST SIX 
HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 55 KNOTS 
GUSTING TO 70 KNOTS. SEE REF B (WTXS31 PGTW 302100) FOR THE FINAL 
WARNING ON THIS SYSTEM.
      (3) NO OTHER TROPICAL CYCLONES.
   B. TROPICAL DISTURBANCE SUMMARY:
      (1) AN AREA OF CONVECTION (INVEST 90S) HAS PERSISTED NEAR 8.3S 
102.7E, APPROXIMATELY 218 NM SOUTHEAST OF CHRISTMAS ISLAND. ANIMATED 
ENHANCED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS WIDESPREAD 
FLARING CONVECTION OBSCURING AN ELONGATED LOW LEVEL CIRCULATION CENTER 
(LLCC). A 301506Z ASCAT REVEALED AN AREA OF SHARP TROUGHING WITH 20-25 
KNOT WINDS ON EITHER SIDE OF THE TROUGH AXIS. ENVIRONMENTAL ANALYSIS 
FOR  THE AREA INDICATES A FAVORABLE ENVIRONMENT WITH WARM SEA SURFACE 
TEMPERATURES (29-30 C), LOW TO MODERATE VERTICAL WIND SHEAR (15-20 
KTS), AND GOOD POLEWARD OUTFLOW ALOFT. GLOBAL DETERMINISTIC AND 
ENSEMBLE MODELS ARE IN GOOD AGREEMENT THAT 90S WILL CONTINUE TO 
CONSOLIDATE AND TRACK SOUTHEASTWARD OVER THE NEXT 24-48 HOURS.  
MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 23 TO 28 KNOTS. 
MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1006 MB. THE 
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN 
THE NEXT 24 HOURS IS MEDIUM.
      (2) NO OTHER SUSPECT AREAS.
   C. SUBTROPICAL SYSTEM SUMMARY: NONE.
3. JUSTIFICATION FOR REISSUE: ADDED MEDIUM AREA IN PARA. 2.B.(1).//
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