ABPW10 PGTW 290600 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND /SOUTH PACIFIC OCEANS/290600Z-300600ZSEP2021// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/290151ZSEP2021// AMPN/REF A IS A TROPICAL CYCLONE WARNING.// RMKS/ 1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA): A. TROPICAL CYCLONE SUMMARY: (1) AT 29SEP21 0000Z, TYPHOON 20W (MINDULLE) WAS LOCATED NEAR 23.3N 135.4E, APPROXIMATELY 336 NM WEST-SOUTHWEST OF IWO TO, AND HAD TRACKED NORTH-NORTHWESTWARD AT 07 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 115 KNOTS GUSTING TO 140 KNOTS. SEE REF A (WTPN31 PGTW 290300) FOR FURTHER DETAILS. (2) NO OTHER TROPICAL CYCLONES. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 91W) PREVIOUSLY LOCATED NEAR 21.3N 153.2E IS NOW LOCATED NEAR 21.8N 154.8E, APPROXIMATELY 1050 NM SOUTHEAST OF YOKOSUKA, JAPAN. MULTISPECTRAL SATELLITE IMAGERY (MSI) AND A 290314Z AMSR2 89GHZ MICROWAVE IMAGE DEPICT FLARING CONVECTION SHEARED TO THE SOUTHEAST OF AN EXPOSED LOW LEVEL CIRCULATION (LLC). ENVIRONMENTAL ANALYSIS INDICATES MARGINAL CONDITIONS FOR DEVELOPMENT, WITH GOOD EQUATORWARD OUTFLOW AND WARM (30C) SEA SURFACE TEMPERATURES (SST) BEING OFFSET BY MODERATE TO STRONG (20-25 KTS) NORTHWESTERLY VERTICAL WIND SHEAR (VWS) FLOWING OUTWARD FROM TY 20W. NUMERICAL MODELS SHOW LITTLE IN THE WAY OF DEVELOPMENT, REMAINING BELOW WARNING CRITERIA. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 18 TO 22 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1005 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS MEDIUM. (2) NO OTHER SUSPECT AREAS. C. SUBTROPICAL SYSTEM SUMMARY: NONE. 2. SOUTH PACIFIC AREA (WEST COAST OF SOUTH AMERICA TO 135 EAST): A. TROPICAL CYCLONE SUMMARY: NONE. B. TROPICAL DISTURBANCE SUMMARY: NONE. C. SUBTROPICAL SYSTEM SUMMARY: NONE.// NNNN