ABPW10 PGTW 270600 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND /SOUTH PACIFIC OCEANS/270600Z-280600ZOCT2020// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/270151ZOCT2020// AMPN/REF A IS A TROPICAL CYCLONE WARNING.// RMKS/ 1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA): A. TROPICAL CYCLONE SUMMARY: (1) AT 27OCT20 0000Z, TYPHOON 21W (MOLAVE) WAS LOCATED NEAR 13.3N 114.7E, APPROXIMATELY 405 NM EAST-SOUTHEAST OF DA NANG, VIETNAM, AND HAD TRACKED WESTWARD AT 12 KNOTS OVER THE PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 100 KNOTS GUSTING TO 125 KNOTS. SEE REF A (WTPN32 PGTW 270300) FOR FURTHER DETAILS. (2) NO OTHER TROPICAL CYCLONES. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 99W) PREVIOUSLY LOCATED NEAR 15.5N 141.5E IS NOW LOCATED NEAR 15.4N 141.8E, APPROXIMATELY 202 NM NORTHWEST OF GUAM. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS A CONSOLIDATING LOW LEVEL CIRCULATION (LLC) WITH PERSISTENT DEEP CONVECTION OVERHEAD. A 270340Z GMI 89GHZ MICROWAVE IMAGE SHOWS LIMITED DEEP CONVECTION IN THE VICINITY OF THE LLC WITH SOME LOW LEVEL BANDING PRESENT. FURTHERMORE, THE WIND FIELD DEPICTED IN A 262351Z ASCAT-B PASS DEPICTS WEAK (5-10 KTS) WINDS ALONG THE SOUTHWESTERN PERIPHERY OF THE SYSTEM CENTER, AND STRONGER (25-30 KTS) WINDS PRESENT ALONG THE NORTHEASTERN PERIPHERY. INVEST 99W IS CURRENTLY IN A MARGINAL ENVIRONMENT WITH MODERATE UPPER LEVEL OUTFLOW, WARM (30 TO 31 CELSIUS) SEA SURFACE TEMPERATURES AND LOW VERTICAL WIND SHEAR (10-15KNOTS). GLOBAL MODELS ARE IN GOOD AGREEMENT THAT 99W WILL STRENGTHEN AND CONSOLIDATE AS IT TRACKS WEST- SOUTHWESTWARD. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1007 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