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| #1007747 (Received by flhurricane at: 5:06 PM 09.Jul.2020) TCDAT1 Tropical Storm Fay Discussion Number 1 NWS National Hurricane Center Miami FL AL062020 500 PM EDT Thu Jul 09 2020 Satellite and radar imagery, along with surface observations, have shown that the area of the low pressure near the coast of North Carolina reformed closer to the deep convection east of the Outer Banks today. An Air Force Reserve reconnaissance aircraft investigating the disturbance this afternoon confirmed that the center is located near the edge of the primary convective mass, and that the system is producing an area of 35-40 kt winds to the east and southeast of the center. Based on these observations, the system is classified as a tropical storm with an initial intensity of 40 kt. Fay is located over the warm waters of the Gulf Stream and within an area of light to moderate westerly shear. These environmental conditions could allow for slight strengthening tonight and Friday. After that time, the circulation is forecast to interact with the mid-Atlantic coast and will be passing over cooler waters north of the Gulf Stream, likely limiting any further intensification. Fay should weakening quickly once it moves inland Friday night or Saturday. Since a new center has recently formed, the initial motion is a highly uncertain 360/6 kt. Fay is expected to move generally northward between a high pressure ridge over the western Atlantic and an approaching mid-latitude trough. The 12Z dynamical model guidance has come into much better agreement on a track very close to the U.S. mid-Atlantic coast. With the recent center reformation to the northeast, the tracker guidance from the dynamical models shows a track farther offshore than the model fields imply. As a result, the NHC track lies along the left side of the guidance envelope but it is not as far west as what is indicated in the model fields. The NHC track and intensity forecast has required the issuance of a Tropical Storm Warning for a portion of the U.S. coast from the mid-Atlantic states to southern New England. Key Messages: 1. Fay is expected to produce 3 to 5 inches of rain with isolated totals of 8 inches along and near the track across the mid-Atlantic states into southeast New York and southern New England. These rains may result in flash flooding where the heaviest amounts occur. Widespread river flooding is not expected at this time. 2. Tropical storm conditionsare expected along portions of the mid-Atlantic and northeast coast Friday and Friday night, and a Tropical Storm Warning has been issued for the coasts of New Jersey, New York and Connecticut, including Long Island. FORECAST POSITIONS AND MAX WINDS INIT 09/2100Z 35.5N 74.9W 40 KT 45 MPH 12H 10/0600Z 37.1N 74.7W 45 KT 50 MPH 24H 10/1800Z 39.0N 74.3W 45 KT 50 MPH 36H 11/0600Z 41.6N 73.6W 35 KT 40 MPH...INLAND 48H 11/1800Z 45.3N 72.4W 25 KT 30 MPH...INLAND 60H 12/0600Z 49.1N 70.3W 20 KT 25 MPH...POST-TROP/EXTRATROP 72H 12/1800Z...DISSIPATED $$ Forecaster Brown |