Extreme sea levels and wind waves:
Extreme sea levels may represent a substantial hazard for low lying coastal areas. They are caused by a combination of contributions from different factors such as high astronomical tides, storm surges, or wind generated waves at the sea surface.
Globally extreme sea levels have increased over the past decades of years primarily as a consequence of rising mean sea levels while direct contributions from atmospheric forcing such as from surges or wind waves remained relatively constant except for a few places. It is expected that extreme sea levels will continue to rise mainly due to rising mean sea levels.