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Tropical Storm Rose Forecast Discussion Number 9
2021-09-21 10:37:16| National Hurricane Center (Atlantic)
Issued at 500 AM AST Tue Sep 21 2021 000 WTNT42 KNHC 210837 TCDAT2 Tropical Storm Rose Discussion Number 9 NWS National Hurricane Center Miami FL AL172021 500 AM AST Tue Sep 21 2021 Rose has lost organization over the past several hours. Satellite images show a fully exposed low-level center with only a small area of deep convection lingering in the southeastern quadrant. The Dvorak classifications have decreased, and the initial intensity is nudged downward to 40 kt. Rose is moving northwestward at 17 kt. This general heading but with a decrease in forward speed is expected during the next couple of days as the storm is steered by the flow on the southwest side of a low- to mid-level ridge. By late this week and over the weekend, a sharp turn to the north and then the northeast is expected as Rose becomes embedded in the flow on the south side of a broad deep-layer trough. Although there is some spread in the guidance, the models all show the same general theme. The NHC track forecast lies near the middle of the guidance envelope. The environment is expected to become increasingly unfavorable for Rose during the next several days with westerly shear increasing and dry air expected to wrap into the circulation. These conditions should promote a weakening trend, and the cyclone is forecast to become a remnant low by the weekend when it should be over cooler waters and in an environment of more than 30 kt of shear. Some of the models suggest that Rose could become a remnant low or open into a trough sooner than that, and if the current trend continues that is a distinct possibility. The new forecast is largely an update of the previous one, but does show the storm becoming a remnant low a day earlier. FORECAST POSITIONS AND MAX WINDS INIT 21/0900Z 21.0N 36.4W 40 KT 45 MPH 12H 21/1800Z 22.4N 37.2W 40 KT 45 MPH 24H 22/0600Z 23.8N 38.3W 35 KT 40 MPH 36H 22/1800Z 25.0N 39.5W 30 KT 35 MPH 48H 23/0600Z 26.4N 40.6W 30 KT 35 MPH 60H 23/1800Z 27.7N 41.0W 30 KT 35 MPH 72H 24/0600Z 29.0N 40.4W 30 KT 35 MPH 96H 25/0600Z 30.7N 36.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 26/0600Z 32.8N 31.4W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Cangialosi
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