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This U.S. map shows where the chances of major (purple), moderate (light red), or minor (yellow) flooding during March-May 2020 are greater than 50%. The risk of major flooding is limited to Red River states in the North and to a segment of the Upper Mississippi between Iowa and Illinois. However, the ground is saturated across much of the central third of the country, which means a single heavy rain event could cause minor flooding for many areas. NOAA Climate.gov map, based on data from the NWS Water Center.