Tornados can happen anywhere in America but certain areas are known for having a higher frequency and intensity of tornadic activity than others - this area is known as Tornado Alley. The map below shows that 100 years ago, the original Tornado Alley was a region stretching from Texas up into South Dakota, and it kind of looks like an alley. According to AccuWeather, "This region is known for its flat terrain and the clash of warm, moist air from the Gulf of Mexico with cool, dry air from Canada."
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