Tornado Alley
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.
Estelline, Texas
According to the Köppen Climate Classification system, Estelline has a semi-arid climate, abbreviated "BSk" on climate maps.
Estelline, Texas is often referred to as being located at the core of Tornado Alley. Over the years, the location(s) of Tornado Alley have not been clearly defined. No official definition of 'tornado alley' or the geographical area of tornado alley has ever been designated by the National Weather Service Thus, differences of location are the result of the different criteria used.