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.
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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