Expect showers and t-storms from the Plains to the Great Lakes, much wamer in the mid-Mississippi River Valley, rain and snow in the Rockies and evening showers in the Southern Plains.
Powerful thunderstorms will pound the central U.S. Wednesday while more searing heat sizzles the southern Plains and Southeast.
Central U.S.: Thunderstorms will bring hail and damaging winds in a narrow band from the upper Midwest to the southern Plains. Non-severe thunderstorms are also likely in the northern Plains.
Rockies: Rain and some light snow will make for a soggy day in the central and northern Rockies.
Southern tier: Most of the southern U.S. all the way from the Southwest to the Southeast (except for Texas) will see clear skies and summerlike temperatures well into the 80s and 90s.
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Weather history for May 7: In 1840, the Great Natchez tornado slammed Natchez, Miss., killing 317 people and leaving the city in ruins.
In 1992, a freak snowstorm dumped more than four feet of snow in the North Carolina mountains. The temperature also dropped to 27 degrees in Arkansas.