Sea Level Trends: Sea Level Variations of the United States Derived from National Water Level Observation Network Stations

Published by Center for Operational Oceanographic Products and Services | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: August 02, 2026 at 11:01 PM | Dataset Last Updated: January 01, 2018 at 12:00 AM

Water level records are a combination of the fluctuations of the ocean and the vertical land motion at the location of the station. Monthly mean sea level (MSL) variations were analyzed for the stations of the National Ocean Service's (NOS) National Water Level Observation Network (NWLON) having at least 30 years of data. The sea level variations determined are the relative sea level trend, the average seasonal cycle, and the interannual variability at each station. Since the derived trends include the local vertical land motion, they are spatially variable. The relative sea level trend plots include the time series for each station of the monthly MSL with the seasonal cycle removed, a 5-month average, and the linear trend with its 95% confidence interval; the average seasonal cycle; the interannual variation of MSL. The plots are updated monthly and the long-term trend is recalculated every year. The location and timing of any major earthquakes near stations in tectonically-active areas are noted since an associated vertical offset or a change in MSL trend is possible.

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@type	dcat:Dataset
accessLevel	non-public
contactPoint	{ "fn": "Not provided - Contact data.gov", "hasEmail": "mailto:datagovsupport@gsa.gov" }
describedByType	application/octet-steam
description	Water level records are a combination of the fluctuations of the ocean and the vertical land motion at the location of the station. Monthly mean sea level (MSL) variations were analyzed for the stations of the National Ocean Service's (NOS) National Water Level Observation Network (NWLON) having at least 30 years of data. The sea level variations determined are the relative sea level trend, the average seasonal cycle, and the interannual variability at each station. Since the derived trends include the local vertical land motion, they are spatially variable. The relative sea level trend plots include the time series for each station of the monthly MSL with the seasonal cycle removed, a 5-month average, and the linear trend with its 95% confidence interval; the average seasonal cycle; the interannual variation of MSL. The plots are updated monthly and the long-term trend is recalculated every year. The location and timing of any major earthquakes near stations in tectonically-active areas are noted since an associated vertical offset or a change in MSL trend is possible.
distribution	[ { "@type": "dcat:Distribution", "title": "https://tidesandcurrents.noaa.gov/sltrends/sltrends.shtml", "format": "HTML", "mediaType": "text/html", "description": "Relative Sea Level Trends page and interactive map. Zoom in/out and pan around in the map. Arrows represent stations, and the direction and rate of relative sea level trend at that those locations. Click any arrow to access the linear sea level trend and other data for that station. NOAA Technical Reports related to Sea Level Trends are linked at the bottom of this page.", "downloadURL": "https://tidesandcurrents.noaa.gov/sltrends/sltrends.shtml", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "https://mapservices.weather.noaa.gov/static/rest/services/NOS_Observations/CO_OPS_Products/MapServer", "accessURL": "https://mapservices.weather.noaa.gov/static/rest/services/NOS_Observations/CO_OPS_Products/MapServer", "mediaType": "text/html", "description": "Other Documents", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "GCMD Keyword Forum Page", "accessURL": "https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords", "mediaType": "text/html", "description": "Global Change Master Directory (GCMD). 2026. GCMD Keywords, Version 24. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "Full Metadata Record", "accessURL": "https://www.fisheries.noaa.gov/inport/item/37628", "mediaType": "text/html", "description": "View the complete metadata record on InPort for more information about this dataset.", "describedByType": "application/octet-stream" } ]
identifier	https://data.noaa.gov/waf/NOAA/nos/coops/iso/xml/37628.xml
issued	1854-01-01T00:00:00.000+00:00
keyword	[ "EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > SEA LEVEL RISE", "EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > SEA LEVEL RISE > INUNDATION", "EARTH SCIENCE > HUMAN DIMENSIONS > NATURAL HAZARDS > FLOODS", "EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL PROCESSES > FLOODING", "EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL PROCESSES > SEA LEVEL CHANGES", "EARTH SCIENCE > OCEANS > COASTAL PROCESSES > SEA LEVEL RISE", "EARTH SCIENCE > OCEANS > COASTAL PROCESSES > SEA SURFACE HEIGHT", "EARTH SCIENCE > OCEANS > COASTAL PROCESSES > TIDAL HEIGHT", "EARTH SCIENCE > OCEANS > SEA SURFACE TOPOGRAPHY > MEAN SEA SURFACE", "EARTH SCIENCE > OCEANS > SEA SURFACE TOPOGRAPHY > SEA LEVEL", "EARTH SCIENCE > OCEANS > TIDES", "EARTH SCIENCE > OCEANS > TIDES > TIDAL RANGE", "EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER PROCESSES/MEASUREMENTS > FLOODS > FLOOD FREQUENCY", "NGDA", "National Geospatial Data Asset", "Water Oceans and Coasts Theme", "NGDAID178", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALABAMA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CONNECTICUT", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DELAWARE", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DISTRICT OF COLUMBIA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > FLORIDA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GEORGIA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > HAWAII", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > LOUISIANA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MAINE", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MARYLAND", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MASSACHUSETTS", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MISSISSIPPI", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW HAMPSHIRE", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW JERSEY", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW YORK", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NORTH CAROLINA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > OREGON", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > PENNSYLVANIA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > RHODE ISLAND", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > SOUTH CAROLINA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > TEXAS", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > VIRGINIA", "CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WASHINGTON", "OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > BERMUDA", "OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA", "OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > PUERTO RICO", "OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > VIRGIN ISLANDS", "OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA", "OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > AMERICAN SAMOA", "OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS", "OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > JOHNSTON ATOLL", "OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > KIRIBATI", "OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > MIDWAY ATOLL", "OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > WAKE ISLAND", "OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA", "OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN > POLYNESIA > COOK ISLANDS", "OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN > POLYNESIA > FIJI", "OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN > POLYNESIA > FRENCH POLYNESIA", "OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN > POLYNESIA > SAMOA", "OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > MICRONESIA > GUAM", "OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > MICRONESIA > MARSHALL ISLANDS", "ACOUSTIC SOUNDERS", "PRESSURE SENSORS > PRESSURE SENSORS", "TIDE GAUGES > TIDE GAUGES", "WATER LEVEL GAUGES > WATER LEVEL GAUGES", "GOES > NOAA Geostationary Operational Environmental Satellites", "MSL", "MSL change", "Mean Sea Level", "Monthly MSL Variation", "NWLON > National Water Level Observation Network", "NWLON station", "average seasonal cycle", "coastal monitoring", "interannual variability", "long-term water level station", "sea level fall", "sea level trends", "Coastal U.S. territories", "Coastal United States", "Gulf of Mexico", "U.S. Exclusive Economic Zone", "Microwave Water Level (MWWL) Sensor", "DOC/NOAA/NOS/CO-OPS > Center for Operational Oceanographic Products and Services, National Ocean Service, NOAA, U.S. Department of Commerce", "CO-OPS Metadata Library" ]
landingPage	https://www.fisheries.noaa.gov/inport/item/37628
language	[]
license	https://creativecommons.org/publicdomain/zero/1.0/
modified	2018-01-01T00:00:00.000+00:00
publisher	{ "name": "Center for Operational Oceanographic Products and Services", "@type": "org:Organization" }
rights	otherRestrictions, unclassified
spatial	180.0,-14.28,-180.0,61.24
temporal	1854-01-01T00:00:00+00:00/1854-01-01T00:00:00+00:00
theme	[ "geospatial" ]
title	Sea Level Trends: Sea Level Variations of the United States Derived from National Water Level Observation Network Stations

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