Here's a hot report from the National Weather Service.

Highs will top out from the mid 80s across eastern Wisconsin to the lower 90's over much of Minnesota.  Add a very humid air mass and heat indices will make it feel about 10 degrees warmer.

A Thunderstorm complex is expected to explode across the Northern Plains late this afternoon, tracking across the upper Mississippi Valley late tonight.

Strong to severe thunderstorms are likely over central and northern Minnesota..