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.
Tornado outbreak of June 13, 1998
On June 13, 1998, a tornado outbreak occurred across much of the United States. The day saw 45 tornadoes touchdown primarily across Kansas, Nebraska, and Oklahoma. The outbreak saw the Storm Prediction Center outline two Moderate Risk areas in parts of Virginia, North Carolina, and South Carolina, and in parts of Kansas and Nebraska. Additionally, two far more expansive Slight Risk areas were delineated across much of the Central and Eastern United States. By 06:00 UTC June 14, tornadoes had struck parts of six states, including downtown Sabetha, Kansas and parts of North Oklahoma City and vicinity.