Hot temperatures and tropical air are expected to conspire today to push heat indices well above 100 degrees. The featured chart displays the maximum heat index for the past 40 years at the Des Moines Airport sensor. Since 1989, exceeding 100 degrees has not been all that common and the highest recorded value was 110, which happened last year. All of this heat and humidity will help to fire strong thunderstorms this evening with the Storm Prediction Center issuing a moderate risk of severe weather today.

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Tags:   heat