WTPN21 PHNC 231930
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT (91C) CANCELLATION//
REF/A/MSG/JOINT TYPHOON WRNCENPEARL HARBOR HI/221921ZSEP2024//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.//
RMKS/
1. REMARKS: THIS CANCELS REF A (WTPN21 PHNC 221930)
AN AREA OF CONVECTION (INVEST 91C) PREVIOUSLY LOCATED 10.7N 
142.3W, IS LOCATED NEAR 11.8N 142.4W, APPROXIMATELY 914 NM SOUTHEAST OF 
HILO, HAWAII. ANIMATED MULTISPECTRAL SATELLITE IMAGERY DEPICTS INVEST 91C 
WITH A PARTIALLY EXPOSED LOW-LEVEL CIRCULATION CENTER (LLCC) WITH FLARING 
CONVECTION ALONG THE NORTHWESTERN PERIPHERY. FORMATIVE BANDING CAN 
ALSO BE SEEN WRAPPING INTO THE SYSTEM ALONG THE SOUTHERN SEMICIRCLE. 
ENVIRONMENTAL ANALYSIS INDICATES THAT 91C IS IN A UNFAVORABLE 
ENVIRONMENT FOR DEVELOPMENT CHARACTERIZED BY WEAK POLEWARD OUTFLOW ALOFT, 
MODERATE (15-20 KTS) VERTICAL WIND SHEAR, AND WARM (28-29C) SEA SURFACE 
TEMPERATURES. GLOBAL MODELS AGREE THAT 91C WILL STEADILY WEAKEN OVER THE 
NEXT 24 HOURS AS IT CONTINUES TO TRACK GENERALLY WESTWARD.
MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 23 TO 28 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 HIGH. THIS SYSTEM IS NO LONGER EXPECTED TO 
DEVELOP INTO A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS.//
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