The costliest tornado in U.S. history occurred on May 22, 2011 in the town of Joplin, Missouri.
The Joplin tornado caused 161 deaths as well as $2.8 billion in damages.
The deadliest tornado in U.S. history was the Tri-State tornado which occurred on March 18, 1925.
The Tri-State tornado Formed in Ellington, MO and dissipated 3 1/2 hours later near Petersburg, IN, a distance of 219 miles. There were 695 fatalities.