Spring Flood Outlook 2022

This shapefile shows the basins with a 50% or more likelihood of exceeding minor, moderate, and major flood levels during March through May, 2022. The spring flood risks are explained in the National Hydrologic Assessment issued by the National Oceanic and Atmospheric Administration (NOAA), National Weather Service (NWS) on March 17, 2022 (https://www.weather.gov/owp/2022NHA). The National Hydrologic Assessment offers an analysis of flood risk and water supply for spring 2022 based on late summer, fall, and winter precipitation, frost depth, soil saturation levels, snowpack, current streamflow, and projected spring weather. NOAA's network of 122 Weather Forecast Offices, 13 River Forecast Centers, National Water Center, and other national centers nationwide assess this risk and summarize at the national scale.