View of forecast for Madeira Beach, FL on the USGS Total Water Level and Coastal Change Forecast Viewer on August 30, 2023, during Hurricane Idalia

Prior to landfall on the Gulf coast of the Florida peninsula on August 30, 2023, the Coastal Change Hazards Team forecast that 95 percent of beaches were forecast to erode at the dunes’ base, 20 percent of dunes were forecast to be overwashed by storm waves, and 1 percent of dunes were expected to be inundated (completely submerged) by surge, tide, and waves. These real-time forecasts were ongoing in the Total Water Level and Coastal Change Forecast Viewer.