The data are projected extreme sea levels at 46 UK tide gauge locations. The data were produced by the Met Office, using estimates of present-day extreme sea levels provided by the Environment Agency and projections of exploratory extended time-mean sea level change prepared at the Met Office.

Projected extreme sea level values are described for 16 different annual probabilities of exceedance (return levels), ranging from 1:1 to 1:10,000. Confidence levels relating to the 5% and 95% lower and upper bounds of confidence are included.

The data were produced to put the projected future mean sea level change in the context of the present-day extremes. The data were produced by combining the best estimates of present-day extreme sea levels with projections of mean sea level change. The data covers the period from 2020 to 2300 and is available for each decade (i.e., 2020, 2030... 2300).