Total water level (TWL) at the shoreline is the combination of tides, surge, and wave runup. A forecast of TWL is an estimate of the elevation where the ocean will meet the coast and can provide guidance on potential coastal erosion and flooding hazards.
Hurricane Ian eroded Florida dunes
Hurricane Ian made landfall in Southwest Florida as a Category 4 hurricane in September 2022 and impacted both the Gulf of Mexico and Atlantic coasts. This dune in Flagler County, Florida experienced severe erosion due to waves from the storm.
Real-time forecasts of coastal change can be viewed out to 6 days for discrete locations along the U.S. coastline in the Total Water Level and Coastal Change Forecast Viewer.
Photo by Danielle Faletti. Used with permission.