Iowa is part of Great Plains
Every Great Plains region shares one system — the same maps, the same live radar, the same climate record. Iowa is the only state bounded by two navigable rivers, and it is flat, black-soiled and completely exposed. The August 2020 derecho crossed it in fourteen hours with 140-mph winds at Cedar Rapids and flattened a third of the state's corn — the costliest thunderstorm in United States history. The rest of the year Iowa gets the classic Midwest sequence: ice storms on the I-80 line in winter, spring severe from the Missouri Valley east, and a humid corn-sweat July that runs dewpoints into the 80s.