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Tropical Depression Seventeen Forecast Discussion Number 1
2019-10-25 16:32:35| National Hurricane Center (Atlantic)
Issued at 1000 AM CDT Fri Oct 25 2019 000 WTNT42 KNHC 251432 TCDAT2 Tropical Depression Seventeen Discussion Number 1 NWS National Hurricane Center Miami FL AL172019 1000 AM CDT Fri Oct 25 2019 Satellite imagery indicates that the low pressure system in the western Gulf of Mexico has developed a well-defined circulation. In addition, a cluster of strong convection is located near and to the northeast of the low-level center. Thus, advisories are being initiated on Tropical Depression Seventeen. The initial intensity is set at 30 kt, and it is possible based on last night's scatterometer data that this is conservative. A deep-layer baroclinic trough over the southern Plains states should steer the cyclone north-northeastward with an increase in forward speed during the next couple of days, with the center crossing the northern Gulf coast tonight or Saturday morning. The track guidance is in good agreement, and the forecast track lies close to the various consensus models. A surface cold front associated with the baroclinic trough is quickly approaching the center of the depression, and the tropical cyclone is expected to merge with the front during the next 12 h. Based on this, the cyclone is expected to become a gale-force post-tropical low before it reaches the northern Gulf coast. The low should weaken after landfall, with dissipation expected just after 48 h. There is a chance that the system could briefly become a tropical storm this afternoon before it merges with the cold front. However, even if this occurs it will make little difference to the impacts on the northern Gulf coast. Key messages: 1. Since depression is expected to merge with a cold front and become post-tropical by tonight, hazards related to wind, rainfall and coastal flooding will be covered by products issued by local National Weather Service forecast offices, available at weather.gov FORECAST POSITIONS AND MAX WINDS INIT 25/1500Z 25.6N 94.4W 30 KT 35 MPH 12H 26/0000Z 28.2N 93.1W 35 KT 40 MPH...POST-TROP/EXTRATROP 24H 26/1200Z 32.6N 91.3W 30 KT 35 MPH...POST-TROP/EXTRATROP 36H 27/0000Z 38.1N 89.1W 25 KT 30 MPH...POST-TROP/EXTRATROP 48H 27/1200Z 43.2N 85.4W 20 KT 25 MPH...POST-TROP/EXTRATROP 72H 28/1200Z...DISSIPATED $$ Forecaster Beven
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