What is the smallest F5 or EF5 tornado?

It is difficult to determine especially since a single tornado will oftern vary in size. A likely candidate is the Sherman, Texas tornado of May 15, 1896. This tornado was farily large among much of its path, averaging just under 1/4 mile wide. The actual F5 damage was in the town of Sherman near the end of the path, where the tornado had narrowed to only 60 yards wide. About 50 homes were destroyed of which 20 were completely obliterated.

Another candidate is the Elie, Manitoba tornado of June 22, 2007. This tornado was somewhat similar to the one that hit Sherman in that the F5 damage ocurred when the tornado narrowed near the end of its lifespan. The tornado reached a maximum width of 330 yards, causing mostly F1 and F2 damage. Near the end of its meandering path it narrowed to less than 100 yards wide and became extremely intense, destoying several homes on the edge of Elie. A well-anchored brick house was ripped from its foundation and thrown.