Mother Nature is definitely wanting to remind us that the calendar still says Winter by delivering another shot or two of Arctic air to the Eastern U.S. for the latter part of this week and lingering into next week. Forecast confidence is high that it will definitely turn sharply colder following a storm system that will cross from the Plains to the eastern seaboard tonight through Thursday.
My confidence is also high that significant rainfall will fall across the lower OH Valley and the TN Valley on Wednesday where ½” to 1 ½” of rain is expected. The rain will be welcome for those in the TN Valley as times have turned dry since abundant rain occurred in December. Currently, Huntsville is already nearly 3” below normal for the year.
The concern for Wednesday will be the threat for severe weather from the TN Valley southward to the Gulf coast. A large area of slight risk has been issued by the Storm Prediction Center. A boundary could enhance severe weather during the afternoon/evening hours, especially from northern AL to northern GA southward. Folks in these areas need to be weather aware and monitor local media and NOAA weather radio for updates. I also recommend checking out WAAY 31’s Weather Call system.
Things then get interesting Friday into Saturday from the Mid MS Valley east-southeastward into the OH/TN Valleys. All models indicate a rather robust “Clipper” system dropping into the Dakotas on Friday morning and quickly dropping SE. The differences are in the exact track and the amount of moisture associated with it. All show a significant shot of reinforcing cold to follow in behind it.
What is interesting is the potential a few of the models are showing for accumulating snow into the TN Valley and portions of the SE. This is a situation that will have to be monitored over the next couple of days. Here is an image from the U.S. long range model showing accumulated snowfall through midday Sunday.