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Tropical Storm Vicky Forecast Discussion Number 2
2020-09-14 16:40:58| National Hurricane Center (Atlantic)
Issued at 200 PM CVT Mon Sep 14 2020 000 WTNT41 KNHC 141440 TCDAT1 Tropical Storm Vicky Discussion Number 2 NWS National Hurricane Center Miami FL AL212020 200 PM CVT Mon Sep 14 2020 A METOP A/B ASCAT scatterometer pass over the cyclone showed a large swath of winds in the northeast quadrant on the order of 35 to 39 kt. Deep convection in that region of the cyclone continues to increase as well as near the center of circulation. Accordingly, the initial intensity is raised to 40 kt, making this the twentieth named storm of the season. This should be a short-lived tropical cyclone, however, as increasing southwesterly shear is expected to quickly weaken Vicky to a depression in a couple days, and the system is expected to degenerate to a remnant low Thursday. This scenario is based on a combination of the global models and the ECMWF and FV3 SHIPS statistical-dynamical intensity models. The initial motion estimate is an uncertain 325/05 kt. The cyclone is forecast to move northwestward with some increase in forward speed during the next 24 hours within the low to mid-level steering flow produced by the eastern end of the African monsoon trough. By Tuesday night, Vicky should turn west-northwestward to westward along the southern periphery of a subtropical ridge over the eastern Atlantic. The official track forecast is close to the various consensus aids and is just to the north of the previous advisory beyond 36 hours. FORECAST POSITIONS AND MAX WINDS INIT 14/1500Z 18.7N 28.5W 40 KT 45 MPH 12H 15/0000Z 19.6N 29.3W 40 KT 45 MPH 24H 15/1200Z 20.6N 30.5W 35 KT 40 MPH 36H 16/0000Z 21.6N 32.4W 35 KT 40 MPH 48H 16/1200Z 22.2N 34.6W 30 KT 35 MPH 60H 17/0000Z 22.7N 36.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 17/1200Z 23.0N 39.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 18/1200Z 23.1N 42.2W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 19/1200Z...DISSIPATED $$ Forecaster Roberts
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