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North America’s Tornado Alley is an area in the United States that has frequent tornadoes. The term "Tornado Alley" is from a research project from 1952. This project was based on the severe weather conditions in Texas, Oklahoma, Kansas, South Dakota, Iowa, Illinois, Missouri, Nebraska, Colorado, North Dakota, and Minnesota.

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The reason tornadoes occur in these areas is because of the low-level warm, moist air with dry, relatively cold air aloft and strong wind shear. Wind shear is the change of the horizontal winds in the environment with altitude.

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The phenomenon occurs in this area because warm, wet air that blows in from the Gulf of Mexico and this is where it meets cold, dry air coming from the massive Rocky Mountain range. These are the conditions that create possibilities for the tornadoes to occur. The image below shows how the air travels.

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These tornadoes occur during the entire year as shown in the picture with the geographic location. Certain states experience more tornadoes than other.