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#1016818 (Received by flhurricane at: 4:50 AM 15.Sep.2020) TCDAT1 Tropical Storm Vicky Discussion Number 5 NWS National Hurricane Center Miami FL AL212020 500 AM AST Tue Sep 15 2020 Vicky remains sheared this morning with strong upper-level winds causing any deep convection to be located northeast of the center. The low-level circulation has also become distorted as well, with new bursts of convection causing the mean circulation to re-form to the north. The initial wind speed is kept 45 kt since the system isn`t appreciably different than the last cycle. Models all weaken the storm during the next couple of days due to rather potent westerly shear (with 200-mb westerly winds as high as 70 kt forecast across Vicky`s circulation). These extremely harsh conditions should make the intensity prediction rather simple, and Vicky is likely to decay into a remnant low within a day or two and open up into a trough in a few days. The re-formation of the center leads to an uncertain motion estimate of 325/8 kt. The storm should turn west-northwestward later today and westward on Wednesday as it becomes steered by the low-level subtropical ridge. Little change was made to the previous forecast, except for a small northward adjustment in the first day or so of the prediction due to the initial position. FORECAST POSITIONS AND MAX WINDS INIT 15/0900Z 20.3N 30.1W 45 KT 50 MPH 12H 15/1800Z 21.0N 31.2W 40 KT 45 MPH 24H 16/0600Z 21.7N 33.1W 35 KT 40 MPH 36H 16/1800Z 22.2N 35.1W 30 KT 35 MPH...POST-TROP/REMNT LOW 48H 17/0600Z 22.5N 37.0W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 17/1800Z 22.5N 38.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 18/0600Z 22.5N 40.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 19/0600Z...DISSIPATED $$ Forecaster Blake |