Here are the 10 deadliest U.S. tornadoes on record:10. "The Joplin tornado is the deadliest since modern record keeping began in 1950 and is ranked 7th among the deadliest tornadoes in U.S. history," the NWS says on a factsheet. 2011 ended up being the fourth deadliest tornado year in U.S. history, according to the NWS. With 317 killed, this is the second deadliest tornado in U.S. history. The 1925 "Tri-State" Tornado across the MidwestThe deadliest tornado on record in the United States took place on March 18, 1925 when the "Tri-State Tornado" caused a path of destruction across the Midwest.

Source: Fox News May 20, 2019 18:22 UTC