Deadliest United States tornadoesDeadliest United States tornadoes. The cyclone that swept Joplin, Mo., Sunday evening is the latest in a long line of destructive twisters. Here are the 10 most deadly U.S. tornado events on record, by the number of deaths.
March 18, 1925 The Tri-State Tornado
Number of deaths: 695
Where: Missouri, Illinois, Indiana
Find estimated damage: The Tri-State