Webinar – Rising Tides & Changing Waters: NOAA Updates the National Tidal Datum Epoch



Presented on November 17, 2023.

Presented by Michael Michalski , NOAA/NOS/CO-OPS

Safe management and use of US coastal resources requires knowledge of accurate water level heights. A fundamental requirement for managing this data is the periodic update to the National Tidal Datum Epoch (NTDE). Maintained by NOAA’s Center for Operational Oceanographic Products and Services (CO-OPS), NTDE is the collection of water level observations over a 19-year period to generate a set of tidal datums. NTDE incorporates data from 2,000+ coastal water level stations. Updating this reference period will ensure the Nation’s tidal datums are based on recent data and provides a common reference frame to account for long-term effects of land movement, sea level rise and changes in tidal constituents. Accurate tidal datums are critical for federal, state, and private-sector coastal zone activities, including navigation, storm warning, and marine boundary determination.

In 2027, CO-OPS will replace the existing 1983-2001 NTDE. The new 2002-2020 NTDE will include the CO-OPS repository of permanent real-time and historic stations with available data. New datum automation procedures will generate new NTDE products more efficiently to deliver the update on schedule. This webinar aims to inform stakeholders of the NTDE update process and planned outreach, and help user communities prepare for these changes.