National Weather Service United States Department of Commerce

Overview

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A powerful storm system moved northeast across eastern Iowa into southwest Wisconsin sweeping a strong cold front through the area during the afternoon hours of Thursday, April 20th. A line of thunderstorms developed quickly along the front, with some of them surpassing severe thresholds producing hail up to the size of a golf ball.

An EF1 tornado tracked to the northeast for about 6 miles starting just east of Morrison, IL just before 4 PM CDT.

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WPC Surface Fronts and Radar Map
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