We obtain the RMSL data from the NOAA/National Ocean Service at The site offers its users a choice of tidal datums-a base elevation used as a reference from which to reckon the tidal height. These measurements of "relative mean sea level" (RMSL) account not only for global changes in the volume of sea water-driven by factors such as thermal expansion of the ocean and melting of ice sheets, but also local movements of the land as shorelines rise, sink, or remain stable in response to groundwater removal, glacial isostatic adjustment, and other factors. We do so because these measurements represent the value we are most concerned with-the rate of sea-level change relative to piers, buildings, homes, and streets. We obtain the raw monthly mean sea-level measurements for our report cards from NOAA's official tidal station network. Height is measured relative to a standard elevation defined by the National Oceanic and Atmospheric Administration. Thus the sharp ups and downs reflect almost entirely non-tidal changes in water level due to storms and shifts in ocean and estuarine circulation. Represented in light blue, the Monthly Mean Sea Level (MMSL) shows the height of the water at this tidal gauge averaged over a calendar month of measurements corrected by removing predictable tidal variations. Visit the Plotly© website for additional instructions. Double tap the chart to restore defaults. For further instructions, move over the chart, then move over the icons that appear in the upper right-hand corner. To hide or show a data trace, tap a term in the legend.
Move over the chart to reveal individual data values.
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How to Interact with your Projection Chart To learn how to interact with and read your projection chart, expand the selections below.
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