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Tornado Alley is a term used to describe an area between the Rocky Mountains and Appalachian Mountains that is prone to Tornadoes.

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As you can see in the photo, Tornado Alley occurs when cold, dry air from the north collides with the warm, dry air from the southwest, and warm, moist air from the southeast. These air masses meeting along with a northerly moving jet stream create tornado alley.

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Tornado Alley happens due to the plains of Middle America getting very hot in summer, causing updrafts which then cause thunderstorms. Thunderstorms then create tornadoes when the hot air rises up to the cool air in the clouds. This creates a supercell, causing the clouds/cloud to form a vortex.

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Tornado Alley is most active from May til the end of August. In the first 9 days of May, over a 40 year span, there were 2466 tornadoes. These number continue to increase up until the middle of June, where we see a rapid decrease in numbers, dropping off by 200-300/9 days. By the end of August, we see that there have been only 675 tornadoes over the same 40 year span.