Sea Levels Online

The rate of mean sea level rise or fall has been determined for 117 long-term water-level stations. Monthly mean sea-level data were used to obtain the linear trend, the average seasonal cycle, and interannual variations. The linear trend at a coastal location is primarily a combination of the global sea-level rise and any local vertical land movement. The seasonal cycle and interannual variations are caused by fluctuations in coastal ocean temperatures, salinities, winds, atmospheric pressures, and currents. The interannual variations for many Pacific stations are closely related to the El Niño/Southern Oscillation. Assuming no change in trend, the time series of interannual variations are extended up to the latest month, and maps show the regional extent of anomalously high or low water levels.

Select state of interest on the map or from pull-down menu.

Alaska	Hawaii	Other CO-OPS Stations	Global Stations

Region: Select region of interest Maine Massachusettes Rhode Island Connecticut New York Pennsylvania New Jersey Delaware Maryland District of Columbia Virginia North Carolina South Carolina Georgia Florida Lousiana Texas California Oregon Alaska Hawaii Other Stations Global Stations

Map of mean sea level trends	Latest map of mean sea level anomalies

More information is available in NOAA Technical Report NOS CO-OPS 36, "Sea Level Variations of the United States 1854-1999". The calculated trends for all stations are also available as a table in millimeters/year or feet/century. The difficulty in combining various sea-level trends at different stations around the world to determine the rate of global sea-level rise is discussed in "Sea Level as an Indicator of Climate and Global Change" by Dr. Bruce Parker, former chief of NOAA's Coast Survey Development Laboratory (Marine Technology Society Journal, Vol. 25, No. 4, 1991.)