The same storm system producing a blizzard across parts of the Plains will spark a round of severe weather, including a few tornadoes, along the central Gulf Coast on Monday.
The afternoon and evening hours of Monday is when AccuWeather.com meteorologists are most concerned for a widespread outbreak of severe weather, complete with damaging winds, hail, downpours and a few tornadoes.
Violent thunderstorms will be numerous across central and eastern Louisiana and southern Mississippi Monday afternoon. In the evening, they will spread to southern Alabama and the Florida Panhandle.
Cities in the above threat zone include New Orleans, Lafayette and Baton Rouge, La., Hattiesburg and Gulfport, Miss., Mobile and Montgomery, Ala., and Pensacola, Fla.
Flash flooding could become a big problem as areas get hit with multiple rounds of thunderstorms that can produce rainfall rates of 2 to 3 inches per hour.
People traveling along Interstates 10, 55, 59 and 65 should prepare for slow travel in severe thunderstorms and potential ponding on the roadway.
Local road closures are possible in low lying areas after some areas pick up 2 to 4 inches of rain in multiple rounds of thunderstorms.
Strong thunderstorms will shift eastward during the overnight hours of Monday, threatening Tallahassee and Jacksonville, Fla., and Albany and Valdosta, Ga.
Residents are urged to heed severe weather watches and warnings, which will be issued tonight through Monday.
Click on our Severe Weather Center for more information and expert videos.
AccuWeather.com Senior Meteorologist Kristina Pydynowski contributed to the content of this story.
Big changes are on the way for parts of the Western and Central states late this week and into this weekend.
Similar to the days prior to Thanksgiving, the worst weather will focus on the days prior to Christmas as millions of travelers take to the roads and skies in the U.S. and southern Canada.
Despite a brief warmup in Chicago, wintry conditions will span the weekend.
Warm air is forecast to surge into much of the eastern half of the nation by the weekend and will be accompanied by heavy rain and flooding risk in some locations.
Thunderstorms in parts of the South this weekend may become strong enough to threaten lives and property.
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Riverside RS (Yellowstone Park), WY: -59 degrees, lowest U.S. temp in December.
West Palm Beach, FL (1989)
Record high of 88 degrees.
Milwaukee, WI (2000)
49.5" of snow in December - snowiest December on record.