Tornado outbreak of April 14–16, 2011
From April 14–16, 2011, a tornado outbreak, among the largest recorded tornado outbreaks in U.S. history, produced 179 confirmed tornadoes across 16 states, resulting in severe destruction on all three days of the outbreak. A total of 38 people were killed from tornadoes and an additional five people were killed as a result of straight-line winds associated with the storm system.
Source: Wikipedia — Tornado outbreak of April 14–16, 2011 (CC BY-SA 4.0)