ABIO10 PGTW 181800 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN/OCEAN/181800Z-191800ZDEC2020// 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: NONE. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 93S) PREVIOUSLY LOCATED NEAR 7.4S 86.8E IS NOW LOCATED NEAR 8.6S 87.2E, APPROXIMATELY 552 NM WEST-NORTHWEST OF THE COCOS ISLANDS. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY AND AN 181241Z SSMIS F-17 91H IMAGE DEPICT A WEAK LOW-LEVEL CIRCULATION WITH FLARING CONVECTION OVERHEAD. INVEST 93S IS CURRENTLY IN A MARGINALLY FAVORABLE ENVIRONMENT FOR DEVELOPMENT WITH WARM (29-30C) SEA SURFACE TEMPERATURES, WEAK POLEWARD OUTFLOW, AND LOW (<15 KNOT) VERTICAL WIND SHEAR. GLOBAL MODELS ARE IN GENERAL AGREEMENT SHOWING INVEST 93S TRACKING GENERALLY EAST-SOUTHEASTWARD WITH LITTLE TO NO INTENSIFICATION. 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. (2) AN AREA OF CONVECTION (INVEST 94S) IS LOCATED NEAR 13.5S 128.2E, APPROXIMATELY 197 NM WEST-SOUTHWEST OF DARWIN, AUSTRALIA. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY AND AN 181256Z MHS METOP-B 89GHZ MICROWAVE IMAGE DEPICT A WEAK LOW-LEVEL CIRCULATION (LLC) WITH FLARING CONVECTION SHEARED ALONG THE NORTHWESTERN PERIPHERY OF THE DISTURBANCE. A RECENT 181141Z ASCAT-A IMAGE REVEALS 10-15 KNOT WINDS WRAPPING INTO THE LLC WITH 20-25 KNOT CONVERGENT WESTERLY WINDS. INVEST 94S IS CURRENTLY IN A FAVORABLE ENVIRONMENT FOR DEVELOPMENT WITH WARM (30-31C) SEA SURFACE TEMPERATURES, GOOD OUTFLOW, AND LOW TO MODERATE (10-20 KNOTS) VERTICAL WIND SHEAR. GLOBAL MODELS ARE IN GENERAL AGREEMENT SHOWING INVEST 94S WILL SLIGHTLY INTENSIFY AS IT CONTINUES TO TRACK WEST-SOUTHWESTWARD ALONG THE AUSTRALIAN COAST, WHICH WILL HINDER DEVELOPMENT, BEFORE TURNING MORE INLAND. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1002 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS LOW. (3) NO OTHER SUSPECT AREAS. C. SUBTROPICAL SYSTEM SUMMARY: NONE.// NNNN