(CNN) A clash of record-breaking heat in the South and more seasonable weather to the North will lead to severe storms across 17 states Wednesday, putting 52 million people at risk.

A slight risk -- level 2 of 5 -- stretches from Missouri to the Carolinas and from Iowa to Georgia. It also includes a part of Texas.

"All forms of severe weather are possible today and tonight, with very large hail and damaging winds the primary threat," says CNN meteorologist Dave Hennen. "Tornadoes are also likely, especially in the enhanced risk area."

This enhanced risk area -- level 3 of 5 -- is in place for parts of western Ohio Valley, central Mississippi Valley, and Tennessee Valley.

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