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Tropical Storm Fay Forecast Discussion Number 6
2020-07-10 22:46:55| National Hurricane Center (Atlantic)
Issued at 500 PM EDT Fri Jul 10 2020 000 WTNT41 KNHC 102046 TCDAT1 Tropical Storm Fay Discussion Number 6 NWS National Hurricane Center Miami FL AL062020 500 PM EDT Fri Jul 10 2020 Fay's structure is looking less tropical this afternoon. While the central circulation is decidedly warm core, it is lacking deep convection and consists entirely of low to mid-level clouds. The deepest convection is found in cloud bands located well east and southeast of the center. The initial intensity is set to 45 kt, with the strongest winds found in a convective band northeast of the center as seen in velocity data from the KOKX WSR-88D. The last fix from the earlier aircraft mission provided a central pressure estimate of 998 mb. Gradual weakening should occur from here on as the cyclone begins to interact more with land, however stronger winds are expected to persist over water even after the center moves inland tonight. Fay is shown as a 35-kt tropical storm inland at 12 hours, but those winds are expected to be over water well southeast of the center by that time. On Saturday, Fay should weaken as a post-tropical cyclone and dissipate in 36 to 48 hours. The initial motion estimate is 010/12 kt. The track forecast reasoning remains unchanged, as Fay will be steered generally northward and north-northeastward until dissipation between a mid-level ridge over the western Atlantic and an approaching shortwave trough moving across the Great Lakes. The new NHC track forecast is close to the previous one and lies near the middle of the guidance envelope. Users should not place too much emphasis on the exact track of the center of Fay, as heavy rainfall and strong winds will continue to affect areas well away from the cyclone's center. Key Messages: 1. Heavy rainfall from northern Delaware and eastern Pennsylvania northeast across New Jersey, southeast New York, and portions of New England may result in flash flooding and urban flooding in areas with poor drainage. While isolated minor flooding is possible, widespread river flooding is not expected. 2. Tropical storm conditions will continue to spread northward across portions of the mid-Atlantic and northeast coast today and tonight, and a Tropical Storm Warning is in effect for the coasts of New Jersey, New York, and Connecticut, including Long Island. FORECAST POSITIONS AND MAX WINDS INIT 10/2100Z 39.5N 74.3W 45 KT 50 MPH...ON THE COAST 12H 11/0600Z 41.7N 73.8W 35 KT 40 MPH...INLAND 24H 11/1800Z 45.7N 72.4W 25 KT 30 MPH...POST-TROP/INLAND 36H 12/0600Z 49.6N 69.6W 25 KT 30 MPH...POST-TROP/INLAND 48H 12/1800Z...DISSIPATED $$ Forecaster Brennan
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