Coastal flooding along the heavily populated Eastern Seaboard of the United States has dramatically increased in recent years, according to a recent climate investigation from Reuters that utilized 50 years of tide gauge data. The average number of days per year that tidal waves have reached or surpassed flooding thresholds—levels set by the National Oceanic and Atmospheric Administration at which water begins collecting on surface streets—has more than tripled in many locations.
Since 2001, water has hit these flooding thresholds an average of 20 days or more a year in several East Coast cities, including: Sandy Hook, NJ; Atlantic City, NJ; Annapolis, MD; Washington, D.C.; Wilmington, NC; and Charleston, SC. Preceding 1971, none of those five cities had averaged more than five flood-level days a year. Annapolis has experienced the highest average number of days above the flood threshold since 2001: 34