ABIO10 PGTW 081800 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN OCEAN/081800Z-091800ZDEC2020// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/080751ZDEC2020// REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/080521ZDEC2020// NARR/REF A IS A TROPICAL CYCLONE WARNING. REF B IS A TROPICAL /CYCLONE FORMATION ALERT.// 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 08DEC20 0600Z, TROPICAL CYCLONE 02S (BONGOYO) WAS LOCATED NEAR 16.8S 78.1E, APPROXIMATELY 1199 NM EAST OF PORT LOUIS, MAURITIUS, AND HAD TRACKED SOUTHWESTWARD AT 15 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 55 KNOTS GUSTING TO 70 KNOTS. SEE REF A (WTXS31 PGTW 080900) FOR FURTHER DETAILS. (2) NO OTHER TROPICAL CYCLONES. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 96S) PREVIOUSLY LOCATED NEAR 11.5S 107.6E IS NOW LOCATED NEAR 11.1S 108.1E, APPROXIMATELY 307 NM SOUTH-SOUTHEAST OF JAKARTA, INDONESIA. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY DEPICTS PERSISTENT CONVECTION OBSCURING A LOW LEVEL CIRCULATION CENTER (LLCC). A 081131Z SSMIS 91GHZ MICROWAVE IMAGE REVEALS LOW LEVEL BANDING WITH A POCKET OF DEEP CONVECTION OVER THE LLCC. INVEST 96S IS IN A MARGINAL ENVIRONMENT FOR DEVELOPMENT WITH MODERATE TO HIGH (15-25KTS) VERTICAL WIND SHEAR, POLEWARD OUTFLOW ALOFT, AND WARM (29-30C) SEA SURFACE TEMPERATURES. GLOBAL MODELS ARE IN FAIR AGREEMENT THAT INVEST 96S WILL CONTINUE TO TRACK SOUTHEASTWARD TOWARDS AUSTRALIA WITH SOME CONSOLIDATION BEFORE MAKING LANDFALL. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 28 TO 33 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 998 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS HIGH. SEE REF B (WTXS22 PGTW 080530) FOR FURTHER DETAILS. (2) THE AREA OF CONVECTION (INVEST 99S) PREVIOUSLY LOCATED NEAR 16.8S 119.4E IS NOW LOCATED NEAR 17.4S 120.2E, APPROXIMATELY 120 NM WEST-NORTHWEST OF BROOME, AUSTRALIA. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY DEPICTS LOW LEVEL TURNING WITH PERSISTENT CONVECTION OVERHEAD. A 081302Z MHS 89GHZ PARTIAL MICROWAVE IMAGE REVEALS AN AREA OF DEEP CONVECTION WITH FORMATIVE BANDING WRAPPING INTO A LOW LEVEL CIRCULATION CENTER (LLCC). INVEST 99S IS IN A MARGINAL ENVIRONMENT FOR DEVELOPMENT WITH MODERATE (15-25KTS) VERTICAL WIND SHEAR, POLEWARD OUTFLOW ALOFT, AND WARM (29-30C) SEA SURFACE TEMPERATURES. GLOBAL MODELS ARE IN FAIR AGREEMENT THAT INVEST 99S WILL CONSOLIDATE MARGINALLY AS IT TRACKS SOUTHEASTWARD TOWARDS AUSTRALIA. 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 REMAINS LOW. (3) NO OTHER SUSPECT AREAS. C. SUBTROPICAL SYSTEM SUMMARY: NONE.// NNNN