12/17 – Brantly’s “Cold Morning, Chilly Afternoon” Thursday Forecast
In general, zonal flow has taken hold aloft over the northern Gulf coast as an upper trough makes its way towards the east coast. This will persist until Friday morning when a brief period of weak ridging then moves over the region. At the surface, high pressure will continue to build over the southeastern CONUS through Friday morning. By late Friday afternoon, this high pressure will begin to move to the northeast over the Appalachians in response to a low pressure system developing over the Plains. As for sensible weather, much colder temperatures with no rain chances will be the main theme through the remainder of the work week.
Cold air advection continues to surge southward over the deep south early this morning. Despite the colder air, a large canopy of low stratus from the Tennessee Valley down into Louisiana persists as seen on the Nighttime Microphysics satellite imagery. This has helped to offset how low temperatures are dropping off early this morning. Current temperatures across the region are in the mid to upper 30s inland and in the lower to mid 40s along the coast. Thus, lows are still on track to dip into the lower to mid 30s inland and in the upper 30s to lower 40s along the coast early this morning. Low clouds are trapped under a well defined, strong subsident inversion as shown by local upper air soundings. Thus, overcast conditions look to remain in place through this morning. Skies will then likely begin to slowly mix out by this afternoon, with mostly clear skies expected through Friday.