Strong to severe thunderstorms with wind damage and isolated large hail are possible across parts of the mid to upper Mississippi Valley, eastward into the Great Lakes this afternoon and evening. By late afternoon, a cold front will be approaching the state. This will be the focal point for severe storm development. Storms will develop along a line extending from Des Moines, to Madison, Wisconsin, ahead of the cold front. Initially, storms should be isolated, which is when the best potential for all modes of severe weather will be possible.
As storms track off to the southeast, they will grow upscale and merge into a line. This will create for a damaging wind threat up to 70-mph and quarter sized hail.
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