WeatherWhys for March 27,2015 from accuweather.com

A tornado outbreak brought March 2007 to an end across the central United States. The worst of the outbreak occurred from the afternoon of March 28 to the early morning hours of March 29 when dozens of tornadoes touched down from the Texas Panhandle to western Nebraska. A storm system that emerged from the Four Corners region was the culprit of the violent weather.