Both the Appalachian region and the Midwest experience the worst floods . Widespread severe flooding is rare . Some exceptions include the Great Mississippi Flood of 1927 , the Great Flood of 1993 , and widespread flooding and mudslides caused by the 1982 – 83 El Niño event in the western United States . Localized flooding can , however , occur anywhere . Mudslides from heavy rain can even cause problems in any mountainous areas , particularly in the Southwest . The narrow canyons of many mountain areas in the west and severe thunderstorm activity during the monsoon season in summer leads to sometimes devastating flash floods as well . On the other hand , Nor'easter snowstorms can bring activity to a halt in both the New England and Great Lakes regions
Great Mississippi Flood of 1927
Great Mississippi Flood of 1927
Climate of the United States