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Remnants of Fred Forecast Discussion Number 21
2021-08-14 22:39:58| National Hurricane Center (Atlantic)
Issued at 500 PM EDT Sat Aug 14 2021 040 WTNT41 KNHC 142039 TCDAT1 Remnants Of Fred Discussion Number 21 NWS National Hurricane Center Miami FL AL062021 500 PM EDT Sat Aug 14 2021 Satellite imagery this afternoon shows that a broad and elongated circulation has formed in association with the remnants of Fred, and that the convection has become more concentrated at the east end of the elongated center. However, neither the circulation nor the convection are organized enough to justify calling the system a tropical cyclone at this time. An Air Force Reserve Hurricane Hunter aircraft is scheduled to survey the remnants of Fred this evening to see how far the re-development has progressed. The initial motion is a still very uncertain 300/11. The system is expected to move northwestward around the western periphery of the subtropical ridge, with a turn toward the north expected as the system nears and moves inland along the northern Gulf coast in 48-60 h. The forecast guidance remains in good agreement on this general scenario and the new NHC forecast track is close the the consensus models. However, some adjustments to the track forecast could occur depending on where the center of Fred re-forms. Therefore, users should not concentrate on the details of the forecast track, which could change quite a bit during the next day or so. The global models are now in better agreement that the upper-level trough over the eastern Gulf of Mexico that has been hindering the development of Fred will move northward and weaken during the next 24 h. They also indicate that Fred is likely to re-form a well-defined closed circulation over the eastern Gulf of Mexico Sunday morning. Thus, the intensity forecast now calls for Fred to regain tropical cyclone status in about 12 h, followed by gradual strengthening until landfall in a less than ideal upper-level wind environment. After landfall, the system should weaken and dissipate between 96-120 h. The new NHC intensity forecast follows the overall trend of the intensity guidance. Although no coastal watches or warnings are currently in effect, the National Hurricane Center will continue 6-hourly advisories on the remnants of Fred in anticipation of re-development. Watches could be required for portions of the northern Gulf coast tonight, and warnings may be required on Sunday. KEY MESSAGES: 1. Today through Monday, heavy rainfall could lead to areal, urban, and small stream flooding impacts, and cause new and renewed river flooding across southern Florida, the Big Bend, and Panhandle. From Monday onward, heavy rain and flood impacts could extend into other portions of the Southeast and into the southern and central Appalachians and Piedmont as Fred interacts with a front in the area. 2. Fred is forecast to regenerate as a tropical cyclone over the Gulf of Mexico tonight or on Sunday, and bring a risk of tropical storm conditions to portions of the northern Gulf coast, especially from coastal Mississippi to the Florida Panhandle beginning on Monday. Watches may be required for a portion of this area tonight, and warnings may be required on Sunday. FORECAST POSITIONS AND MAX WINDS INIT 14/2100Z 24.0N 84.6W 30 KT 35 MPH...DISTURBANCE 12H 15/0600Z 25.0N 85.7W 30 KT 35 MPH...TROPICAL CYCLONE 24H 15/1800Z 26.6N 87.1W 35 KT 40 MPH 36H 16/0600Z 28.0N 87.9W 40 KT 45 MPH 48H 16/1800Z 29.4N 88.2W 45 KT 50 MPH 60H 17/0600Z 30.9N 88.3W 35 KT 40 MPH...INLAND 72H 17/1800Z 32.4N 88.2W 25 KT 30 MPH...INLAND 96H 18/1800Z 36.0N 87.5W 20 KT 25 MPH...POST-TROP/INLAND 120H 19/1800Z...DISSIPATED $$ Forecaster Beven
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Category:Transportation and Logistics