Thunderstorms can certainly quickly change steamy temperatures into pleasant values. On Tuesday, Marshalltown went from 87 to 69 degrees over an hour thanks to thunderstorm processed air. The featured chart presents the peak one hour temperatures drops for the site based on available hourly observations. Of course, since these are discrete samples in time, actual temperature drops over 60 minutes could be higher. The storms have also brought locally heavy rainfall leading to flooding.

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