what was the worst tornado of all time
(CNN) -- Here are the 10 deadliest tornadoes to touch down in the United States, according to the National Oceanic and Atmospheric Administration: 1. The Tri-State Tornado killed 695 people and injured 2,027, traveling more than 300 miles through Missouri, Illinois and Indiana on March 18, 1925.CNN) -- Here are the 10 deadliest tornadoes to touch down in the United States, according to the National Oceanic and Atmospheric Administration: 1. The Tri-State Tornado killed 695 people and injured 2,027, traveling more than 300 miles through Missouri, Illinois and Indiana on March 18, 1925.