ZCZC MIATCDEP1 ALL TTAA00 KNHC DDHHMM Tropical Storm Kevin Discussion Number 16 NWS National Hurricane Center Miami FL EP112021 200 AM PDT Wed Aug 11 2021 The satellite presentation has degraded during the past several hours and consists of an ill-defined surface circulation with an associated ragged looking curved band in the south semi-circle. The initial intensity is lowered to 40 kt for this advisory and is based on a blend of the Dvorak satellite intensity estimates from TAFB and SAB. Statistical-dynamical SHIPS (GFS and ECMWF) intensity guidance show the moderate northeasterly shear persisting, and as a result, displacing the deep convective mass from the surface center for another 24-36 hours. Later today, Kevin should begin moving over decreasing (sub-26C) sea surface temperatures, and by mid-period, entering a more statically stable and drier surrounding environment. Therefore, steady weakening is forecast through the remaining period, and Kevin is expected to become a depression tonight, and degenerate into a remnant low by Thursday night. The NHC intensity forecast is basically an update of the previous one, but now shows the cyclone opening up into a trough of low pressure a little sooner, similar to the global model solutions. Kevin's surface center has been difficult to find this morning. A timely SSMI/S microwave overpass, however, indicated that initial position was a little south than previously noted, and the initial motion is estimated to be northwestward, or 315/8 kt. Kevin is being steered by a mid-tropospheric ridge to the northeast of the cyclone and either a northwestward or west-northwestward motion is forecast during the next 4 days. The official track forecast has been nudged a bit to the left of the previous advisory, due to the position adjustment, and is in agreement with the better performing HCCA and TVCN multi-model consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 11/0900Z 19.8N 116.4W 40 KT 45 MPH 12H 11/1800Z 20.7N 117.5W 35 KT 40 MPH 24H 12/0600Z 22.1N 119.6W 30 KT 35 MPH 36H 12/1800Z 23.3N 121.6W 30 KT 35 MPH 48H 13/0600Z 24.5N 123.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 13/1800Z 25.6N 126.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 14/0600Z 27.0N 127.8W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 15/0600Z...DISSIPATED $$ Forecaster Roberts NNNN
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Page last modified: Friday, 31-Dec-2021 12:09:59 UTC