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.
Tornado outbreak of mid-November 2005
The tornado outbreak of mid-November 2005 was a tornado outbreak on November 15, 2005, in the Midwestern United States. It occurred along a cold front separating warm, humid air from the southeast from cold Arctic air to the north and northwest. At least 50 confirmed tornadoes have been reported in the central United States in the states of Alabama, Arkansas, Illinois, Indiana, Kentucky, Missouri and Tennessee over that afternoon and evening. Strong winds and large hail caused additional damage throughout the region. The National Weather Service confirmed 49 tornado touchdowns during the outbreak.