Tornadoes are natures most violent storms.

The famous "Tri-state" tornado of March 18, 1925 is the deadliest tornado in the United States. It killed 695 people and traveled at 60-73 mph over a 219 mile long track across parts of Missouri, Illinois and Indiana.

On April 3rd and 4th, 1974, 147 tornadoes touched down in 13 states. 318 people were killed and 5477 injured. Seven were rated F5 and 23 were rated F4.

In 1967, Hurricane Beulah spawned 115 tornadoes.

On June 9, 1971 in the Texas Panhandle a tornado touched down measuring over 2 miles wide at times with an average width of nearly 1 and 1/2 miles. It is the biggest known tornado.

Exact wind speeds have never been directly measured, but remote sensors have clocked wind speeds as high as 318 miles per hour (compared to about 200 miles per hour for the strongest hurricane).

A tornado in Oklahoma on May 3, 1999 was the most destructive tornado in history causing over $1 billion in damage.

Oklahoma City has had over 100 tornadoes.