Speaking of "EF6," I was just thinking about that on a lazy, windy Saturday here in PA. From everything I've read, this is my list of what I consider F5+++ or "F6" tornadoes since the 1950s.
Flint-Beecher MI, 1953
Udall, KS, 1955
Hudsonville, MI, 1956
Dunlap (Sunnyside) IN, 1965
Pittsfield - Strongsville, OH, 1965
Guin, AL, 1974
Brandenburg, KY, 1974
Jordan, IA, 1976
Niles-Wheatland PA/OH, 1985
Bakersfield Valley, TX 1990
Andover, KS 1991
Red Rock, OK 1991
Jarrell, TX 1997
Bridge Creek, OK 1999
Loyal Valley, TX 1999
Harper, KS 2004
Greensburg, KS 2007
Parkersburg, IA 2008
New Wren, MS 2011
Smithville, MS 2011
Philadelphia, MS 2011
Rainsville, AL 2011
Hackleburg-Phil, AL Campbell 2011
El Reno-Piedmont, OK 2011
Joplin, MO 2011
Moore, OK 2011
Vilonia, AR 2014
Holly Springs, MS 2015 [the violence at that drag strip was unbelievable]
Chapman, KS 2016 [I'm obviously thinking of that railroad damage]
Any comments?
As a Pennsylvanian, I obviously wanted to add the Moshannon State Forest tornado...
