Tri-State Tornado

The Tri-State Tornado was the deadliest tornado in the history of the United States. It took place on Wednesday, March 18, 1925. It was during an outbreak of 12 confirmed tornadoes. It covered a large portion of the Midwest and Southern United States.
The death toll from one tornado alone was 695. In Illinois, there were 613 deaths. There were 11 deaths in Missouri. There were at least 71 deaths in Indiana.
The tornado wasn't officially rated by the National Oceanic and Atmospheric Administration. But it is recognized by most experts as an F5 tornado on the U.S. Fujita scale.
There were also tornadoes in Kentucky, Kansas, Alabama and Tennessee.
In 2018 U.S. dollars, damage from the tornadoes was $2.18 billion.