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 April 27–28, 2002
The Tornado outbreak of April 27–28, 2002 was a widespread outbreak that afectted areas of Iowa, Kansas, Missouri and Nebraska were affected on April 27. More tornadoes were reported in Illinois, Indiana, Kentucky, Maryland, New York, Ohio, Pennsylvania, Tennessee, Virginia and West Virginia on the following day, April 28.