Google Flood Hub

Google Flood Hub maps current river conditions and forecasts from Google’s riverine flood models, including higher-confidence physical gauges and wider coverage from virtual gauges. Forecasts extend up to seven days, while inundation-probability layers are available in supported areas. It does not cover flash or coastal floods, does not produce urban flood maps, and should not be used as the sole source during an emergency; check government and local weather-service warnings as well.