ABIO10 PGTW 171800 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN /OCEAN/171800Z-181800ZJAN2021// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/171351ZJAN2021// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/170751ZJAN2021// NARR/REFS A AND A ARE TROPICAL CYCLONE WARNINGS.// 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 17JAN21 1200Z, TROPICAL CYCLONE 10S (JOSHUA) WAS LOCATED NEAR 18.9S 89.4E, APPROXIMATELY 1214 NM SOUTHEAST OF DIEGO GARCIA, AND HAD TRACKED SOUTHWESTWARD AT 08 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 40 KNOTS GUSTING TO 50 KNOTS. SEE REF A (WTXS31 PGTW 171500) FOR FURTHER DETAILS. (2) AT 17JAN21 0600Z, TROPICAL CYCLONE 12S (ELOISE) WAS LOCATED NEAR 12.6S 62.1E, APPROXIMATELY 528 NM NORTH-NORTHEAST OF PORT LOUIS, MAURITIUS, AND HAD TRACKED WESTWARD AT 12 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 35 KNOTS GUSTING TO 45 KNOTS. SEE REF A (WTXS32 PGTW 170900) FOR FURTHER DETAILS. (3) NO OTHER TROPICAL CYCLONES. B. TROPICAL DISTURBANCE SUMMARY: NONE. C. SUBTROPICAL SYSTEM SUMMARY: NONE.// NNNN