ABPW10 PGTW 170600 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND /SOUTH PACIFIC OCEANS/170600Z-180600ZFEB2021// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/170051ZFEB2021// AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT// RMKS/ 1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA): A. TROPICAL CYCLONE SUMMARY: NONE. B. TROPICAL DISTURBANCE SUMMARY: (1) THE AREA OF CONVECTION (INVEST 91W) PREVIOUSLY LOCATED NEAR 7.4N 134.7E IS NOW LOCATED NEAR 6.6N 134.3E, APPROXIMATELY 55 NM SOUTH-SOUTHWEST OF KOROR, REPUBLIC OF PALAU. ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS FORMATIVE CONVECTIVE BANDING WRAPPING INTO AN OBSCURED LOW LEVEL CIRCULATION CENTER (LLCC). A 170056Z METOP-B 89GHZ SATELLITE IMAGE REVEALS AN AREA OF DEEP CONVECTION CENTERED OVER THE LLCC. INVEST 91W IS IN A FAVORABLE ENVIRONMENT FOR DEVELOPMENT WITH LOW TO MODERATE (10-20 KT) RELATIVE VERTICAL WIND SHEAR, GOOD POLEWARD AND WESTWARD OUTFLOW, AND WARM (29-30C)SEA SURFACE TEMPERATURES. GLOBAL MODELS ARE IN GOOD AGREEMENT THAT 91W WILL STRENGTHEN AND CONSOLIDATE AS IT TRACKS WEST-NORTHWESTWARD. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 18 TO 23 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1004 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS REMAINS HIGH. SEE REF A (WTPN21 PGTW 161400) FOR FURTHER DETAILS. (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