largest tornado of all time
'Amazing' Oklahoma tornado was largest in U.S. history. In this May 31, 2013 file photo a tornado forms near Banner Road and Praire Circle in El Reno, Okla. The National Weather Service says the deadly tornado that struck near Oklahoma City late last week was another top-of-the-scale EF5 that packed winds reaching 295 mph. The weather service also says the twister's 2.6-mile width is the widest ever recorded.