ABIO10 PGTW 111800 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN /OCEAN/111800Z-121800ZJAN2021// 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) AN AREA OF CONVECTION (INVEST 99S) HAS PERSISTED NEAR 11.0S 86.0E, APPROXIMATELY 643 NM WEST OF COCOS ISLANDS. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY AND A 111623Z METOP-B 89GHZ MICROWAVE PASS REVEALS DISORGANINZED BANDING WRAPPING INTO A WEAK LOW LEVEL CIRCULATION CENTER (LLCC). INVEST 99S IS IN AN ENVIRONMENT FAVORABLE FOR FURTHER TROPICAL DEVELOPMENT WITH GOOD WESTWARD UPPER LEVEL OUTFLOW AND WARM (29-30C) SEA SURFACE TEMPERATURES, OFFSET BY STRONG (25-30KTS) VERTICAL WIND SHEAR. GLOBAL MODELS ARE IN GOOD AGREEMENT THAT INVEST 99S WILL TRACK WEST AND INTENSIFY 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 1003 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.// NNNN