“Tornado Alley” earns its namesake by being a region where atmospheric and climatic conditions are exceptionally suitable for tornado development. “The land in the Great Plains is relatively flat, which allows cold dry polar air from Canada to meet warm moist tropical air from the Gulf of Mexico.” (from here) When these fronts meet, tornadoes form!
Tornado Alley is generally known to be between the Rocky and Appalachian mountains. Although it’s a term popularized by the media, it has some scientific relevancy to it. Tornadoes happen more often there because cool air travels down from the North to meet with the warm, humid air of the Gulf of Mexico. These conditions make for perfect tornado weather.
there are a lot because it is humid there.
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