Is all of Iowa in tornado alley What cities in Iowa in tornado Alley?

There are no exact boundaries to Tornado Alley, but it appears that at least the western half of Iowa is in it, though all of Iowa is prone to tornadoes. This western portion would include the cities of Estherville, Algona, Plymouth, Cherokee, Sioux City, Fort Dodge, Webster City, Carroll, Boone, Ames, Perry, Des Moines, Newton, Atlantic, Red Oak, and Creston as well as smaller communities not listed.