SeaLevelTracker provides real-time water level data from NOAA tidal stations across the US coastline. All data comes from the NOAA Tides and Currents API.

Data Sources

• NOAA Tides and Currents — water level observations from the National Water Level Observation Network
• MSL Datum — water levels referenced to Mean Sea Level

What the Data Means

Water levels shown are relative to Mean Sea Level (MSL). Positive values mean water is above the long-term average; negative values mean below. Storm surges, king tides, and sea level rise all contribute to elevated readings.

Disclaimer

Data is cached and may be delayed. For official forecasts and warnings, consult NOAA Tides and Currents.