Question: The 1947 Glazier–Higgins–Woodward tornadoes were compared to the tornado that took place on what date?
Sentence (from "Tri-State Tornado"): Although not officially rated by NOAA, it is recognized by most experts (such as Tom Grazulis<ref name="F5/F6"> </ref> and Ted Fujita) as an F5 tornado, the maximum damage rating issued on the Fujita scale.
Relevant evidence: No