Tornado Alley
Although the official boundaries of Tornado Alley are not clearly defined, its core extends from northern Texas, Oklahoma, Kansas, Nebraska, into South Dakota. States such as Missouri, Iowa, Minnesota, Wisconsin, Illinois, Indiana, and western Ohio are sometimes included in Tornado Alley. Some research suggests that tornadoes are becoming more frequent in the northern parts of Tornado Alley where it reaches the Canadian prairies.
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.