Tornado Alley
States such as Missouri, Iowa, Minnesota, Wisconsin, Illinois, Indiana, and western Ohio are sometimes included in Tornado Alley. Research suggests that tornadoes are becoming more frequent in the northern parts of Tornado Alley where it reaches the Canadian prairies.
Norman, Oklahoma
Norman lies within Tornado Alley, the region of the United States where tornadic activity is most frequent. The city has a tornado season lasting from March through June, with over 80% of all reported tornadoes occurring during these months. The Oklahoma City metropolitan area, including Norman, is the most tornado-prone area in the United States. As recently as May 10, 2010, a tornado outbreak occurred in southeastern Norman that resulted in the loss of multiple homes and businesses. On April 13, 2012 Norman was struck by a weak tornado. On May 6, 2015, the northwestern part of Norman was hit by a weak tornado.