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ZCZC MIATCDAT5 ALLTTAA00 KNHC DDHHMMPost-Tropical Cyclone Maria Discussion Number  59NWS National Hurricane Center Miami FL       AL152017500 PM AST Sat Sep 30 2017Active deep convection at the center of Maria appears to have ceasedthis morning after the cyclone crossed a sharp SST gradient, andSSTs below 23 deg C are unlikely to allow persistent convection toredevelop.  Recent visible satellite imagery and data from a latearriving ASCAT pass at 1348 UTC indicate the presence of a sharpwind shift extending from near the center of Maria well to thenortheast, suggesting that the cyclone has acquired frontalcharacteristics. Based on this, Maria is now classified asextratropical, and this is the last advisory.The earlier ASCAT data was used as the basis for the initialintensity of 45 kt.  Maria has continued to move quickly toward theeast-northeast, and all of the models indicate that thepost-tropical cyclone will continue on this track for the next dayor two.  Gradual weakening is anticipated until dissipation occurswithin a larger frontal zone over the North Atlantic in about 48hours.  The NHC forecast incorporates guidance from NOAA's OceanPrediction Center.FORECAST POSITIONS AND MAX WINDSINIT  30/2100Z 42.0N  43.9W   45 KT  50 MPH...POST-TROPICAL 12H  01/0600Z 43.8N  39.0W   45 KT  50 MPH...POST-TROP/EXTRATROP 24H  01/1800Z 46.4N  31.4W   40 KT  45 MPH...POST-TROP/EXTRATROP 36H  02/0600Z 48.9N  23.0W   35 KT  40 MPH...POST-TROP/EXTRATROP 48H  02/1800Z...DISSIPATED$$Forecaster ZelinskyNNNN