May 20
- 1957 – A catastrophic F5 tornado moved through the suburbs of Kansas City, Missouri, with the worst damage in Ruskin Heights, sweeping away many homes, killing 37 people, and injuring at least 500. This tornado, or a previous member of the tornado family killed 7 others in Kansas including 5 near Spring Hill.
- 2013 – A large EF5 tornado devastated parts of Moore, Oklahoma, killing 23 people. It was the second F5 or EF5 tornado to affect Moore, the other striking in 1999. Seven of the dead were students at Plaza Towers Elementary School. Damage totaled $2 billion, one of the costliest tornadoes in U.S. history.