<P> It has also been asserted that there are numerous Tornado Alleys . In addition to the Texas / Oklahoma / Kansas core, such areas include the Upper Midwest, the lower Ohio Valley, the Tennessee Valley and the lower Mississippi valley . Some studies suggest that there are also smaller tornado alleys located across the United States . </P> <P> The tornado alleys in the southeastern U.S., notably the lower Mississippi Valley and the upper Tennessee Valley, are sometimes called by the nickname "Dixie Alley", coined in 1971 by Allen Pearson, former director of the National Severe Storms Forecasting Center (NSSFC). </P> <P> In Tornado Alley, warm, humid air from the equator meets cool, dry air from Canada and the Rocky Mountains . This creates an ideal environment for tornadoes to form within developed thunderstorms and super cells . </P> <P> The term "tornado alley" was first used in 1952 by U.S. Air Force meteorologists Major Ernest J. Fawbush (1915--1982) and Captain Robert C. Miller (1920--1998) as the title of a research project to study severe weather in parts of Texas and Oklahoma . </P>

Why are there so many tornadoes in kansas
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