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.
Tornadoes of 2015
On April 2, upper-level southwesterly flow overspread the Ozarks and Ohio River Valley, where an Enhanced risk for severe weather was introduced by the SPC. A surface low tracked into Ontario, supporting a cold front down into southern Missouri. Throughout the afternoon hours, a shortwave trough tracked across the Central Plains, providing ample lift for the development of severe thunderstorms. Several weak tornadoes were recorded. On April 3, the Enhanced risk shifted southeast, encompassing portions of Kentucky, Tennessee, Mississippi, and Alabama. An EF2 tornado tracked north of Pomona, Missouri, in the pre-dawn hours, damaging or destroying several buildings. Several tornadoes of lesser intensity were observed farther east.