Deadly tornadoes sweep through Louisiana and surrounding states | USA TODAY #Shorts

At least three people are dead and at least five are injured after tornadoes touched down in the South.

RELATED: Two tornadoes touch down on either side of the highway

More than 30 million Americans across the nation's northern tier were under winter weather advisories or warnings Wednesday while tornadoes swept the South as a deadly winter storm continued its damaging march through the country, killing at least three.

A line of tornadoes and severe storms rolling through Oklahoma, Texas, Louisiana, Mississippi, Alabama and Florida was blamed for at least three deaths and dozens of injuries. Blizzard conditions forced closures of scores of interstates and other roads in Colorado, Wyoming, Nebraska, Kansas, South Dakota and North Dakota.

"Powerful storm continues to bring heavy snow, blizzards, and difficult to impossible travel conditions in the north/south Plains and Great Lakes," the weather service said in an alert Wednesday. "In the South, severe storms with all hazards, including strong tornadoes, and heavy rain with flash flooding continues."

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