{"action":"create","ckan_id":null,"date_created":"Mon, 01 Sep 2025 21:45:01 GMT","date_finished":null,"harvest_job_id":"6ce03e0a-cc57-4d44-836c-30e9fe186066","harvest_source_id":"83c1a3f8-53a6-470a-8a1f-3b06ef3ea26c","id":"ec354011-7dbd-4652-93e2-0920ce750c64","identifier":"https://data.noaa.gov/waf/NOAA/nos/coops/iso/xml/69876.xml","parent_identifier":null,"source_hash":"9ed3f855185debe7002000eeb905d7251613d795a523cdc49825e283a92dc459","source_raw":"\r\n \r\n gov.noaa.nmfs.inport:69876\r\n \r\n \r\n eng\r\n \r\n \r\n UTF8\r\n \r\n \r\n dataset\r\n \r\n \r\n Mixed\r\n \r\n \r\n \r\n \r\n Center for Operational Oceanographic Products and Services\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n resourceProvider\r\n \r\n \r\n \r\n \r\n \r\n \r\n Stakeholder Services Branch\r\n \r\n \r\n \r\n \r\n \r\n \r\n 301-713-2815\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n tide.predictions@noaa.gov\r\n \r\n \r\n \r\n \r\n \r\n \r\n pointOfContact\r\n \r\n \r\n \r\n \r\n 2025-05-15T19:15:54\r\n \r\n \r\n ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data\r\n \r\n \r\n ISO 19115-2:2009(E)\r\n \r\n \r\n \r\n \r\n \r\n \r\n Extreme Water Levels from CO-OPS\r\n \r\n \r\n Extreme Water Levels\r\n \r\n \r\n \r\n \r\n 2013\r\n \r\n \r\n creation\r\n \r\n \r\n \r\n \r\n \r\n \r\n 2013\r\n \r\n \r\n publication\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n NOAA/NMFS/EDM\r\n \r\n \r\n \r\n \r\n \r\n 69876\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://www.fisheries.noaa.gov/inport/item/69876\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n Full Metadata Record\r\n \r\n \r\n View the complete metadata record on InPort for more information about this dataset.\r\n \r\n \r\n information\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://tidesandcurrents.noaa.gov/publications/NOAA_Technical_Report_NOS_COOPS_067a.pdf\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n Extreme Water Levels of the United States 1893-2010\r\n \r\n \r\n 2013 Technical Report on Extreme Water Levels\r\n \r\n \r\n download\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://tidesandcurrents.noaa.gov/sea_level_info.html\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n CO-OPS Sea Level and Coastal Flooding Information\r\n \r\n \r\n CO-OPS Sea Level and Coastal Flooding Information landing page\r\n \r\n \r\n download\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://tidesandcurrents.noaa.gov/\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n Home page for NOAA Tides and Currents\r\n \r\n \r\n CO-OPS main page\r\n \r\n \r\n download\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Extremely high or low water levels at coastal locations are an important public concern and a factor in coastal hazard assessment, navigational safety, and ecosystem management. The probability that water levels will exceed a given elevation is based on a statistical analysis of historical extremely high and low water levels. This product provides annual exceedance probability levels for select Center for Operational Oceanographic Products and Services (CO-OPS) water level stations with at least 30 years of data. When used in conjunction with real-time station data, exceedance probability levels can be used to evaluate current conditions and determine whether a rare event is occurring. This information may also be instrumental in planning for the possibility of dangerously high or low water events at a local level.\r\n\r\nThe extreme levels measured by the CO-OPS tide gauges during storms are called storm tides, which are the total observed seawater level during a storm, resulting from the combination of storm surge and the astronomical tide. They do not include wave runup, the movement of water up a slope. Therefore, the 1% annual exceedance probability levels do not necessarily correspond to the Base Flood Elevations (BFE) defined by the Federal Emergency Management Administration (FEMA), which are the basis for the National Flood Insurance Program. The 1% annual exceedance probability levels more closely correspond to FEMA's Still Water Flood Elevations (SWEL). The peak levels from tsunamis, which can cause high-frequency fluctuations at some locations, have not been included in this statistical analysis due to their infrequency during the periods of historic record.\r\n \r\n \r\n This dataset provides statistical analysis showing the likelihood of water levels exceeding a given elevation for select NOAA stations, given the difficulty in recreating the same series from observed data.\r\n \r\n \r\n NOAA's National Ocean Service, CO-OPS\r\n \r\n \r\n onGoing\r\n \r\n \r\n \r\n \r\n Stakeholder Services Branch\r\n \r\n \r\n \r\n \r\n \r\n \r\n 301-713-2815\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n tide.predictions@noaa.gov\r\n \r\n \r\n \r\n \r\n \r\n \r\n pointOfContact\r\n \r\n \r\n \r\n \r\n \r\n \r\n Stakeholder Services Branch\r\n \r\n \r\n \r\n \r\n \r\n \r\n 301-713-2815\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n tide.predictions@noaa.gov\r\n \r\n \r\n \r\n \r\n \r\n \r\n custodian\r\n \r\n \r\n \r\n \r\n \r\n \r\n annually\r\n \r\n \r\n \r\n \r\n \r\n \r\n EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > COMPOUND EXTREME EVENTS\r\n \r\n \r\n EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > EXTREME WEATHER\r\n \r\n \r\n EARTH SCIENCE > LAND SURFACE > GEOMORPHIC LANDFORMS/PROCESSES > COASTAL PROCESSES > FLOODING\r\n \r\n \r\n EARTH SCIENCE > OCEANS\r\n \r\n \r\n EARTH SCIENCE > OCEANS > COASTAL PROCESSES > SEA SURFACE HEIGHT\r\n \r\n \r\n EARTH SCIENCE > OCEANS > COASTAL PROCESSES > TIDAL HEIGHT\r\n \r\n \r\n EARTH SCIENCE > OCEANS > MARINE ENVIRONMENT MONITORING\r\n \r\n \r\n EARTH SCIENCE > OCEANS > TIDES\r\n \r\n \r\n EARTH SCIENCE > OCEANS > TIDES > STORM SURGE\r\n \r\n \r\n EARTH SCIENCE > OCEANS > TIDES > TIDAL HEIGHT\r\n \r\n \r\n EARTH SCIENCE > OCEANS > TIDES > TIDAL RANGE\r\n \r\n \r\n theme\r\n \r\n \r\n \r\n \r\n Global Change Master Directory (GCMD) Science Keywords\r\n \r\n \r\n \r\n 17.0\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n CONTINENT\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALABAMA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CONNECTICUT\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DELAWARE\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DISTRICT OF COLUMBIA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > FLORIDA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GEORGIA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > HAWAII\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > LOUISIANA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MAINE\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MARYLAND\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MASSACHUSETTS\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MISSISSIPPI\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW HAMPSHIRE\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW JERSEY\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW YORK\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NORTH CAROLINA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > OREGON\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > PENNSYLVANIA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > RHODE ISLAND\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > SOUTH CAROLINA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > TEXAS\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > VIRGINIA\r\n \r\n \r\n CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WASHINGTON\r\n \r\n \r\n OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > BERMUDA\r\n \r\n \r\n OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA\r\n \r\n \r\n OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > PUERTO RICO\r\n \r\n \r\n OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > VIRGIN ISLANDS\r\n \r\n \r\n OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA\r\n \r\n \r\n OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > AMERICAN SAMOA\r\n \r\n \r\n OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS\r\n \r\n \r\n OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > JOHNSTON ATOLL\r\n \r\n \r\n OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > MIDWAY ATOLL\r\n \r\n \r\n OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > WAKE ISLAND\r\n \r\n \r\n OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > MICRONESIA > GUAM\r\n \r\n \r\n OCEAN > PACIFIC OCEAN > WESTERN PACIFIC OCEAN > MICRONESIA > MARSHALL ISLANDS\r\n \r\n \r\n place\r\n \r\n \r\n \r\n \r\n Global Change Master Directory (GCMD) Location Keywords\r\n \r\n \r\n \r\n 20.8\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n ACOUSTIC SOUNDERS\r\n \r\n \r\n PRESSURE SENSORS > PRESSURE SENSORS\r\n \r\n \r\n TIDE GAUGES > TIDE GAUGES\r\n \r\n \r\n WATER LEVEL GAUGES > WATER LEVEL GAUGES\r\n \r\n \r\n instrument\r\n \r\n \r\n \r\n \r\n Global Change Master Directory (GCMD) Instrument Keywords\r\n \r\n \r\n \r\n 17.2\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n GOES > NOAA Geostationary Operational Environmental Satellites\r\n \r\n \r\n platform\r\n \r\n \r\n \r\n \r\n Global Change Master Directory (GCMD) Platform Keywords\r\n \r\n \r\n \r\n 17.2\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Coastal Sea LevelStations\r\n \r\n \r\n NWLON > National Water Level Observation Network\r\n \r\n \r\n NWLON station\r\n \r\n \r\n PORTS > Physical Oceanographic Real-Time System\r\n \r\n \r\n coastal monitoring\r\n \r\n \r\n storm tide\r\n \r\n \r\n tides and currents\r\n \r\n \r\n water level predictions\r\n \r\n \r\n theme\r\n \r\n \r\n \r\n \r\n \r\n \r\n Coastal U.S. territories\r\n \r\n \r\n Coastal United States\r\n \r\n \r\n Gulf of Mexico\r\n \r\n \r\n place\r\n \r\n \r\n \r\n \r\n \r\n \r\n Microwave Water Level (MWWL) Sensor\r\n \r\n \r\n instrument\r\n \r\n \r\n \r\n \r\n \r\n \r\n DOC/NOAA/NOS/CO-OPS > Center for Operational Oceanographic Products and Services, National Ocean Service, NOAA, U.S. Department of Commerce\r\n \r\n \r\n dataCentre\r\n \r\n \r\n \r\n \r\n Global Change Master Directory (GCMD) Data Center Keywords\r\n \r\n \r\n \r\n \r\n 2017-04-24\r\n \r\n \r\n publication\r\n \r\n \r\n \r\n \r\n 8.5\r\n \r\n \r\n \r\n \r\n Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA)\r\n \r\n \r\n \r\n \r\n \r\n \r\n https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords\r\n \r\n \r\n GCMD Keyword Forum Page\r\n \r\n \r\n Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. 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\r\n \r\n \r\n information\r\n \r\n \r\n \r\n \r\n \r\n \r\n custodian\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n CO-OPS Metadata Library\r\n \r\n \r\n project\r\n \r\n \r\n \r\n \r\n InPort\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n otherRestrictions\r\n \r\n \r\n Cite As: Center for Operational Oceanographic Products and Services, [Date of Access]: Extreme Water Levels from CO-OPS [Data Date Range], https://www.fisheries.noaa.gov/inport/item/69876.\r\n \r\n \r\n \r\n \r\n \r\n \r\n NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.\r\n \r\n \r\n \r\n \r\n \r\n \r\n otherRestrictions\r\n \r\n \r\n Access Constraints: None.\r\n \r\n \r\n \r\n \r\n \r\n \r\n otherRestrictions\r\n \r\n \r\n Use Constraints: While most of the results are based on verified data, there are situations where a station malfunctions during a storm, but post-storm visits allow to discern how high the water reached from a mud/debris line on site or at nearby buildings. If the debris lines are leveled to the station bench marks or to a known datum such as NAVD88, that was added to the instrument-observed levels as the maximum for that month. None of that information is captured in any of our other published products. An accurate exceedance probability analysis strongly depends on not missing the most extreme levels during the period of observations.\r\n \r\n \r\n \r\n \r\n \r\n \r\n otherRestrictions\r\n \r\n \r\n Distribution Liability: While most of the results are based on verified data, there are situations where a station malfunctions during a storm, but post-storm visits allow to discern how high the water reached from a mud/debris line on site or at nearby buildings. If the debris lines are leveled to the station bench marks or to a known datum such as NAVD88, that was added to the instrument-observed levels as the maximum for that month. None of that information is captured in any of our other published products. An accurate exceedance probability analysis strongly depends on not missing the most extreme levels during the period of observations.\r\n \r\n \r\n \r\n \r\n \r\n \r\n unclassified\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n NOAA Data Management Plan (DMP)\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n NOAA/NMFS/EDM\r\n \r\n \r\n \r\n \r\n \r\n 69876\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/co-ops/dmp/pdf/69876.pdf\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n NOAA Data Management Plan (DMP)\r\n \r\n \r\n NOAA Data Management Plan for this record on InPort.\r\n \r\n \r\n information\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n crossReference\r\n \r\n \r\n \r\n \r\n eng; US\r\n \r\n \r\n climatologyMeteorologyAtmosphere\r\n \r\n \r\n geoscientificInformation\r\n \r\n \r\n oceans\r\n \r\n \r\n Observed data are recorded and transmitted, then go through a quality control procedure and are loaded into a database. For Extreme Water Levels, typically the verified monthly and annual maxima/minima are used. Prior to the extreme analysis being completed, the long term sea level trend is removed so that maximum or minimum levels reached by an event in the past can be compared to an equivalent event today.\r\n \r\n \r\n \r\n \r\n \r\n \r\n -180\r\n \r\n \r\n 180\r\n \r\n \r\n -14.3\r\n \r\n \r\n 61.3\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n | Currentness: Ground Condition\r\n 2013\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Because these levels are station specific, their use for evaluating surrounding areas may be limited. A NOAA Technical Report, \"Extreme Water Levels of the United States 1893-2010\" describes the methods and data used in the calculation of the exceedance probability levels. Additionally, Section 3.2 of the \"2022 Sea Level Rise Technical Report\" discusses regional frequency analysis of tide gauge data.\r\n\r\nThe datasets that were analyzed consist of a series of verified monthly maximum and minimum water levels. The series were detrended before selecting annual maximum and minimum water levels. Additionally, while most of the results are based on verified data, there are situations where a station malfunctions during a storm, but post-storm visits allow to discern how high the water reached from a mud/debris line on site or at nearby buildings. If the debris lines are leveled to the station bench marks or to a known datum such as NAVD88, that was added to the instrument-observed levels as the maximum for that month. None of that information is captured in any of our other published products. An accurate exceedance probability analysis strongly depends on not missing the most extreme levels during the period of observations.\r\n \r\n \r\n \r\n \r\n \r\n \r\n false\r\n \r\n \r\n eng\r\n \r\n \r\n false\r\n \r\n \r\n \r\n \r\n Latest detailed information on sensors and accuracy can be found at: https://tidesandcurrents.noaa.gov/publications/CO-OPS_Measurement_Spec.pdf\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://tidesandcurrents.noaa.gov/publications/CO-OPS_Measurement_Spec.pdf\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n Entity Attribute Detail URL\r\n \r\n \r\n Entity Attribute Detail URL\r\n \r\n \r\n information\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n html\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n json, xml\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Center for Operational Oceanographic Products and Services\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://tidesandcurrents.noaa.gov/\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n Tides and Currents\r\n \r\n \r\n Website listed for Center for Operational Oceanographic Products and Services\r\n \r\n \r\n information\r\n \r\n \r\n \r\n \r\n \r\n \r\n distributor\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://tidesandcurrents.noaa.gov/est/\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n https://tidesandcurrents.noaa.gov/est/\r\n \r\n \r\n CO-OPS Extreme Water Levels page\r\n \r\n \r\n download\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n https://api.tidesandcurrents.noaa.gov/dpapi/prod/\r\n \r\n \r\n WWW:LINK-1.0-http--link\r\n \r\n \r\n https://api.tidesandcurrents.noaa.gov/dpapi/prod/\r\n \r\n \r\n CO-OPS Derived Products API\r\n \r\n \r\n download\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n dataset\r\n \r\n \r\n \r\n \r\n \r\n \r\n Accuracy\r\n \r\n \r\n Observed data are recorded and transmitted, then go through a quality control procedure and are loaded into a database. For Extreme Water Levels, typically the verified monthly and annual maxima/minima are used. Prior to the extreme analysis being completed, the long term sea level trend is removed so that maximum or minimum levels reached by an event in the past can be compared to an equivalent event today.\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Completeness Report\r\n \r\n \r\n While most of the results are based on verified data, there are situations where a station malfunctions during a storm, but post-storm visits allow to discern how high the water reached from a mud/debris line on site or at nearby buildings. If the debris lines are leveled to the station bench marks or to a known datum such as NAVD88, that was added to the instrument-observed levels as the maximum for that month. None of that information is captured in any of our other published products. An accurate exceedance probability analysis strongly depends on not missing the most extreme levels during the period of observations.\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Conceptual Consistency\r\n \r\n \r\n While most of the results are based on verified data, there are situations where a station malfunctions during a storm, but post-storm visits allow to discern how high the water reached from a mud/debris line on site or at nearby buildings. If the debris lines are leveled to the station bench marks or to a known datum such as NAVD88, that was added to the instrument-observed levels as the maximum for that month. None of that information is captured in any of our other published products. An accurate exceedance probability analysis strongly depends on not missing the most extreme levels during the period of observations.\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Observed data are recorded and transmitted, then go through a quality control procedure and are loaded into a database. For Extreme Water Levels, typically the verified monthly and annual maxima/minima are used. Prior to the extreme analysis being completed, the long term sea level trend is removed so that maximum or minimum levels reached by an event in the past can be compared to an equivalent event today.\r\n \r\n \r\n \r\n \r\n Verified water level data from a water level station (the verified 6-minute data, and the secondary datasets of highs and lows (except for Great Lakes stations), hourly heights, daily means (Great Lakes stations only), and monthly means) are made available roughly one month after collection. This is a 2-step process where one person reviews the data, and if necessary, removes erroneous data or fills gaps by either using data from the station's back-up sensor, predictions for that station, or similar data from proximal stations. With exception of the corrected errors or filled gaps, most preliminary (raw) 6-minute data become the verified 6-minute data. Secondary datasets are also generated during this step. Then a second person reviews the work of the first, and when satisfied, marks the data in the database as \"verified.\" The order in which the 300+ water level stations are processed each month is random, to prevent the same stations or geographical locations from always being first or last. Verified water level data are made available on a monthly basis for the previous month's data.\r\n \r\n \r\n \r\n \r\n Center for Operational Oceanographic Products and Services\r\n \r\n \r\n processor\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n Source Contribution: 6-minute data from various water level instruments supporting the National Water Level Observation Network (NWLON).\r\n \r\n \r\n \r\n \r\n Water level data source\r\n \r\n \r\n \r\n \r\n \r\n National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Operational Oceanographic Products and Services (CO-OPS)\r\n \r\n \r\n publisher\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n 2013\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n","source_transform":null,"status":"error"}