Tornadoes in the United States
The Midwestern states are very prone to tornado activity, as they are part of "Tornado Alley." States included in the area that are hit by tornadoes the most are Oklahoma, Kansas, Missouri, Nebraska, Iowa, and South Dakota. The Midwestern States are often hit by tornadoes during the late spring and early summer months, especially the months of May and June. This is due to the aforementioned air mass moving northward into the Midwest and combining with another air mass that move southward from Canada. This creates unstable air, creating the potential for storms to strike the most during these months. The frequency begins to decrease in the middle of the summer, as the air mass moves northward into the Great Lakes states.
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.