The central states that make up Tornado Alley are typically named to be Texas, Oklahoma, Kansas, Nebraska and South Dakota, but also may include Iowa, Missouri, Illinois, Ohio and Indiana. Tornado Alley is a term created by the media, not the government or any weather agencies, which leaves the exact states that it includes open to interpretation.
Tornado Alley describes a large vertical channel that passes through many states in the central United States. It is the area that contains most of the tornadoes in the country. The high amount of flat, open land and weather conditions throughout the area create good conditions for tornadoes to form.