Sea Level Rise

Computer model simulations of sea level rise for Hawaiʻi, American Samoa, Guam, and Saipan (Commonwealth of the Northern Mariana Islands). Shows inland extent of coastal flooding (inundation) due to sea level rise scenarios at 0 to 10 feet above current-day mean higher high water (MHHW), meaning water levels are shown as they would appear during the highest high tides (excluding wind-driven tides). These maps were created by subtracting NOAA's VDatum MHHW surface from 3-m digital elevation models (DEM) of the land surface.

Green inundation regions indicate "low-lying areas" that are not hydrologically connected to the ocean but have the potential for flooding based on their relatively low elevation and require more detailed analysis.

Maps of confidence are also provided: 80% is considered a high degree of confidence—areas that may be correctly mapped as "inundated" more than 8 out of 10 times.

Data produced in 2014 by NOAA Office for Coastal Management (OCM). These data do not specify timing of inundation and are not appropriate for conducting detailed spatial analysis. The entire risk associated with the results and performance of these data is assumed by the user. These data should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes.