St. Louis tornado Tornado outbreak sequence of April 19–24, 2011 2011 St. Louis tornado Notes References Tornadoes of 1959 F4 tornadoes Tornadoes in the United States Tornadoes in Missouri Tornadoes in Oklahoma Tornadoes in Kansas Tornadoes in Illinois Tornadoes in Indiana Tornadoes in Kentucky Tornadoes in Ohio Tornadoes in Georgia (U.S. state) History of St. Louis