Severe storms threaten Midwest, Plains, and South.

Another round of severe thunderstorms, including tornadoes as strong as EF-2, is expected to hit the Midwest, Plains, and South on Tuesday afternoon and overnight into Wednesday. An estimated 35 million people will be in the path of the front, with 58 million potentially affected. The worst weather is likely to materialize along a vertical line from Des Moines, Iowa, to Little Rock, Arkansas. Climate change could be making the extremes worse, resulting in colder cold fronts, stronger tornadoes, and bigger hailstones in spring, as well as longer, hotter streaks in summer.