Coastal HTF Forecast

Coastal HTF Forecast visualizes short-range Total Water Level (TWL) forecasts and High Tide Flooding (HTF) thresholds for gauge locations along the U.S. Atlantic, Gulf, and Pacific coastlines. FEATURES • Nationwide map — Browse 1,400+ high-tide-flooding threshold locations and 460+ water level stations across the continental United States. • At-a-glance status — Locations are color coded so you can immediately see where forecast water levels are expected to exceed flooding thresholds. • Detailed forecasts — Tap any location to view an interactive chart of forecast water level against its flooding threshold, including the specific time windows when the threshold is exceeded. • Adjustable search radius — Choose a 5 km or 10 km radius for matching nearby water level stations to each flooding threshold location. • Datum details — Water levels are presented relative to Mean Higher High Water (MHHW), converted from NAVD88. • Favorites — Save the locations you monitor most for quick access. • Automatic updates — Forecast data refreshes several times daily. WHO IT'S FOR Coastal researchers, floodplain and emergency managers, mariners, and anyone living along the coast who wants to understand upcoming water level conditions. DATA SOURCE Forecast data is derived from the NOAA National Water Model. This app is an independent research tool and is not affiliated with, endorsed by, or sponsored by NOAA or any government agency. Developed at the Coastal Hydrology Lab, University of Alabama.