Question: The 1947 Glazier–Higgins–Woodward tornadoes were compared to the tornado that took place on what date?
Sentence (from "1947 Glazier–Higgins–Woodward tornadoes"): This event was often compared to the Tri-State Tornado, because it was originally thought to have left a 219-mile path, but it is now believed to have a been part of a family of 8 or 9 tornadoes.
Relevant evidence: Yes