ABIO10 PGTW 082200 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN OCEAN /REISSUED/082200Z-091800ZDEC2020// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/081952ZDEC2020// REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/081951ZDEC2020// REF/C/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/082121ZDEC2020// NARR/REFS A AND B ARE TROPICAL CYCLONE WARNINGS. REF C 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 1800Z, TROPICAL CYCLONE 03S (THREE) WAS LOCATED NEAR 11.0S 108.5E, APPROXIMATELY 750 NM NORTH-NORTHWEST OF LEARMONTH, AUSTRALIA, AND HAD TRACKED EAST- NORTHEASTWARD AT 04 KNOTS (KTS) OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 45 KNOTS GUSTING TO 55 KNOTS. SEE REF A (WTXS32 PGTW 082100) FOR FURTHER DETAILS. (2) AT 08DEC20 1800Z, TROPICAL CYCLONE 02S (BONGOYO) WAS LOCATED NEAR 18.7S 76.8E, APPROXIMATELY 1106 NM EAST OF PORT LOUIS, MAURITIUS, AND HAD TRACKED SOUTHWESTWARD AT 12 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 55 KNOTS GUSTING TO 70 KNOTS. SEE REF B (WTXS31 PGTW 082100) FOR FURTHER DETAILS. (3) NO OTHER TROPICAL CYCLONES. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 96S) PREVIOUSLY LOCATED NEAR 16.8S 119.4E IS NOW THE SUBJECT OF A TROPICAL CYCLONE WARNING. SEE PARA. 2.A.(1) FOR FURTHER DETAILS. (2) THE AREA OF CONVECTION (INVEST 99S) PREVIOUSLY LOCATED NEAR 16.8S 119.4E IS NOW LOCATED NEAR 17.9S 120.8E, APPROXIMATELY 81 NM WEST OF BROOME, AUSTRALIA. ANIMATED ENHANCED INFRARED IMAGERY (EIR) DEPICTS PERSISTENT CONVECTION OBSCURING A LOW LEVEL CIRCULATION CENTER (LLCC). A 081707Z AMSR2 89GHZ MICROWAVE IMAGE REVEALS FORMATIVE BANDING WRAPPING INTO A LLCC. INVEST 99S IS IN A MODERATELY FAVORABLE ENVIRONMENT WITH ROBUST POLEWARD OUTFLOW AND WARM (30-31C) SEA SURFACE TEMPERATURES (SST) OFFSET BY MODERATE (10- 20 KT) VERTICAL WIND SHEAR (VWS). GLOBAL MODELS GENERALLY AGREE THAT 99S WILL BRIEFLY INTENSIFY BEFORE MAKING LANDFALL OVER AUSTRALIA AROUND TAU 12. 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 IS UPGRADED TO HIGH. SEE REF C (WTXS21 PGTW 082130) FOR FURTHER DETAILS. (3) NO OTHER SUSPECT AREAS. C. SUBTROPICAL SYSTEM SUMMARY: NONE. 3. JUSTIFICATION FOR REISSUE: UPGRADED AREA IN PARA 1.B.(1) TO WARNING STATUS. UPGRADED AREA IN PARA 1.B.(2) TO HIGH.// NNNN