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
Over the years, the location(s) of the Canadian Tornado Alley(s) have been better defined. No complete definition of Canadian Tornado Alley has ever been officially designated and announced by the Environment and Climate Change Canada (ECCC).