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.
Canada Tornado Alley
Technically speaking, no province or territory is entirely free of tornadoes; however, they occur more frequently in the Central Canada and Southern Canada, between the Rocky Mountains and the Great Lakes and between the Great Lakes and the St. Lawrence River.