Higher sea levels give coastal storm surges a higher starting point when major storms approach, launching water up along the shore. The resulting storm surge reaches higher and penetrates further inland in low-lying areas. The risk is even greater if storms make landfall during high tides.
For more information: Union of Concerned Scientists, Hurricanes and Climate Change
Superstorm Sandy and storm surge
When Sandy hit New York in 2012 it came during a time of full moon impacted tides. Coupled with the intensity of the storm, and the geography of the area which funneled more water into the hard hit areas, storm surges topped 14 feet in many parts of Brooklyn, far exceeding HighWaterLine | NYC’s modest 10-foot line of 5 years earlier. (More information).