The 1947 Glazier–Higgins–Woodward tornadoes were compared to the tornado that took place on what date?
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. Tri-State Tornado: The Tri-State Tornado of Wednesday, March 18, 1925 was the deadliest tornado in U.S. history.
March 18, 1925