"ABIO10 PGTW 181800\r\nMSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//\r\nSUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN \r\nOCEAN/181800Z-191800ZMAR2025//\r\nREF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/181751ZMAR2025//\r\nAMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.//\r\nRMKS/\r\n   B. TROPICAL DISTURBANCE SUMMARY: NONE.\r\n   C. SUBTROPICAL SYSTEM SUMMARY: NONE.\r\n   B. TROPICAL DISTURBANCE SUMMARY:\r\n      (1) THE AREA OF CONVECTION (INVEST 91S) PREVIOUSLY LOCATED NEAR \r\n12.8S 98.1E IS NOW LOCATED NEAR 13.1S 96.6E, APPROXIMATELY 57.2 NM \r\nSOUTH-SOUTHWEST OF COCOS ISLANDS. ANIMATED ENHANCED INFRARED (EIR) \r\nSATELLITE IMAGERY FROM HIMAWARI-9 DEPICTS CURVED DEEP CONVECTIVE \r\nBANDING OVER A CONSOLIDATING LLCC. A 1532Z AMSU-B MICROWAVE IMAGE SHOWS \r\nTHAT THE VORTEX REMAINS SLIGHTLY TILTED WESTWARD WITH HEIGHT, BUT \r\nCONVECTIVE ORGANIZATION HAS IMPROVED IN THE WESTERN SEMICIRCLE OVER THE \r\nPAST SIX HOURS.  A 181730Z SURFACE OBSERVATION FROM COCOS ISLAND \r\nINTERNATIONAL AIRPORT SHOWS NORTHWESTERLY 26 KNOT WINDS WITH GUSTS OF \r\n37 KNOTS AND AN MSLP VALUE OF 1004MB. ENVIRONMENTAL ANALYSIS INDICATES \r\nTHAT INVEST 91S IS IN A FAVORABLE ENVIRONMENT FOR FURTHER DEVELOPMENT \r\nDUE TO WARM (29-30C) SEA SURFACE TEMPERATURES, MODERATE (15-20 KNOTS) \r\nVERTICAL WIND SHEAR, AND STRONG POLEWARD OUTFLOW ALOFT. GLOBAL MODELS \r\nARE IN AGREEMENT THAT 91S WILL STEADILY DEVELOP AND TRANSIT TO THE \r\nSOUTHWEST DURING THE NEXT 24 HOURS. MAXIMUM SUSTAINED SURFACE WINDS ARE \r\nESTIMATED AT 28 TO 33 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO \r\nBE NEAR 1001 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT \r\nTROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS UPGRADED TO HIGH. SEE REF \r\nA (WTXS21 PGTW 181800) FOR FURTHER DETAILS.\r\n      (2) NO OTHER SUSPECT AREAS.\r\n   C. SUBTROPICAL SYSTEM SUMMARY: NONE.\r\n//"