The US has been hit by six F5 winter tornadoes since 1950, the last ones occurring fifty years ago.
1953-12-05 MS 1957-12-18 IL 1971-02-21 LA 1971-02-21 LA 1971-02-21 MS 1971-02-21 MS # Climate analyst Paul Homewood: "Provisional data from the NWS indicates that the Dec. 2021 tornadoes which hit Mayfield, Kentucky and Edwardsville, Illinois were both EF-3s."
The US has been hit by six F5 winter tornadoes since 1950, the last ones occurring fifty years ago.
1953-12-05 MS
1957-12-18 IL
1971-02-21 LA
1971-02-21 LA
1971-02-21 MS
1971-02-21 MS
1950-2019_all_tornadoes.csv (7.1 mb)

28 Feb 1971, 40 – The Odessa American at Newspapers.com
Illinois was hit by an F5 tornado on December 18, 1957.

19 Dec 1957, Page 1 – The Daily Standard at Newspapers.com