When initially viewing the product, you are presented with a map displaying coastal NOS water level stations across the East and Gulf coasts. Other areas can be viewed by dragging the map or zooming to the desired location or using the Select Area option at the top. Within the map view, stations that may be experiencing flooding are highlighted by blinking pins on the map and are listed within an expandable banner at the top of the map.
Clicking on one of the station markers displays a pop-up with the latest water level observations, tide predictions and if available forecast water levels, overlaid upon known flood impact thresholds.
Water levels are by default displayed relative to the Mean Higher High Water MHHW tidal datum, which is the average of the higher of the two high tides in a day.
Positive water levels indicate that water is higher than the typical high tide at the station. The pop-up also displays information about future high tides and provides a link to the station Inundation History page where more detailed flooding information is available.
Other Coastal Stations - Locations and links to additional coastal water level data at stations operated by other Federal or state agencies e. Geological Survey. Impact Graphics - Select images of past flood events displaying water level data at the nearby water level station at the time the image was taken.
