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Active Weather | Severe Thunderstorm Threat

Severe weather for the South to be followed by cold snap

Caroline Floyd

Tuesday, December 5, 2017, 15:24 - After lashing the mid-south with severe winds and hail on Monday, a low pressure system is making its way eastward, threatening more of the same for the Gulf states.

Strong storms will be possible on Tuesday in the Deep South (greatest threat in central Alabama), although the clash of cold air from the north and humid air from the Gulf will be lessened somewhat as the front starts to stall over the region. That said, significant rainfall is still anticipated on Tuesday from the Tennessee Valley to the lower Mississippi Valley, with some rumbles of thunder and heavy downpours expected throughout the day.

By evening, the front will be pushing into the Atlanta metro and further north in the Piedmont. Rain should clear most of the region overnight Tuesday into Wednesday, with some lingering showers possible along the tail end of the stalled front for the Gulf Coast and the coastal Carolinas.

Behind this system, it'll be the first taste of winter for much of the Southeast as temperatures dive through mid-week. This pattern - with a deep upper-level trough in the east allowing cold air to flood down from the north - is just a taste of things to come, as the pattern seems set to stick around for the next couple of weeks. Well below-normal temperatures (daily negative departures from normal of 10 to 20 degrees F) will be likely from the Great Lakes south to the Gulf Coast from Dec 8 to 12. Subzero temperatures are forecast to shift south into the upper Mississippi Valley on Dec 11 and 12. Luckily, after the first push of Arctic chill, temperatures will start to moderate somewhat going into next weekend.

Watch below: Temperature pattern

La Niña features prominently in our 2017 - 2018 winter forecast. See what the next three months have in store for you.

Thumbnail courtesy Steve Pushman/Aug 2017

Watch below: Several shots of lake-effect snow behind the system

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