Tornado Alley
The term was first used in 1952 as the title of a research project to study severe weather in areas of Texas, Oklahoma, Kansas, South Dakota, Iowa, Missouri, Nebraska, Colorado, North Dakota, and Minnesota. It is largely a media-driven term although tornado climatologists distinguish peaks in activity in certain areas and storm chasers have long recognized the Great Plains tornado belt.
St. Louis tornado history
These tables describe the tornado history for Greater St. Louis. In Missouri, this includes the counties of St. Louis, St. Charles, Franklin, and Jefferson. In Illinois, this includes the counties of Madison, St. Clair, and Monroe. Data for the independent city of St. Louis is not part of these tables unless part of the path of the tornado striking these counties also struck the city.