https://en.wikipedia.org/wiki/Andover_tornado_outbreak
From April 26–27, 1991, multiple supercells across Oklahoma and Kansas led to a regional tornado outbreak.Forced by a potent trough and focused along a dryline, these distinct thunderstorms moved northeast through a moist and highly unstable environment.A total of 55 tornadoes were confirmed, many of which were strong, F2 or greater on the Fujita scale.