WTPS21 PGTW 160600 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL CYCLONE FORMATION ALERT (INVEST 91P) CANCELLATION// REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/150551ZMAR2023// AMPN/ REF A IS A TROPICAL CYCLONE FORMATION ALERT.// RMKS/ 1. REMARKS: THIS CANCELS REF A (WTPS21 PGTW 150600). THE AREA OF CONVECTION (INVEST 91P) PREVIOUSLY LOCATED NEAR 18.1S 171.0W IS NOW LOCATED NEAR 18.2S 173.1W, APPROXIMATELY 260 NM SOUTHWEST OF PAGO PAGO, AMERICAN SAMOA. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND A 160142Z AMSR2 89GHZ MICROWAVE IMAGE DEPICT A FULLY EXPOSED, WELL DEFINED LOW LEVEL CIRCULATION CENTER (LLCC) WITH SPARSE, SHALLOW CONVECTION SHEARED TO THE EASTERN PERIPHERY. THE SYSTEM IS CURRENTLY IN AN UNFAVORABLE ENVIRONMENT WITH AND WARM (28-29C) SST OFFSET BY WEAK EQUATORWARD OUTFLOW AND HIGH (25KT+) VWS. NUMERICAL MODELS ARE NO LONGER SIGNIFICANTLY DEVELOPING THIS SYSTEM. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 20 TO 25 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1008 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS DOWNGRADED TO LOW. // NNNN