Tornado outbreak of April 2–3, 1956
From April 2–3, 1956, a large, deadly tornado outbreak affected the Great Plains, parts of the South, and the upper Midwest in the contiguous United States, especially the Great Lakes region. The outbreak produced at least 55 tornadoes, including an F5 that devastated the Grand Rapids metropolitan area in the U.S. state of Michigan on April 3.
Source: Wikipedia — Tornado outbreak of April 2–3, 1956 (CC BY-SA 4.0)