A look at some of the deadliest U.S. tornadoes

Most fatalities in a single tornado in the United States

* 1. Missouri, Illinois and Indiana, March 18, 1925, 695 deaths.

* 2. Tupelo, Miss., April 5, 1936, 216 deaths.

* 3. Gainesville, Ga., April 6, 1936, 203 deaths.

* 4. Woodwark, Okla., April 9, 1947, 181 deaths.

* 5. Flint, Mich., June 8, 1953, 115 deaths.

* 6. Worcester, Mass., June 9, 1953, 94 deaths.

* 7. Blackwell, Okla., and Udall, Kan., May 25, 1955, 80 deaths.

* 8. Cary-Pugh City, Miss., Feb. 21, 1971, 58 deaths.

* 9. Wichita Falls, Texas, April 10, 1979, 42 deaths.

* 10. Oklahoma City, Okla., May 3, 1999, 36 deaths.

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Sources: Harold E. Brooks and Charles A. Doswell III, National Oceanic and Atmospheric Administration/National Severe Storms Laboratory