Coastal flooding now occurs in many locations not just during storms, but during high tides on sunny days as well.
The National Oceanic and Atmospheric Administration on Wednesday released its annual high tide flooding report, which counts the number of days coastal communities experience rising waters that are not associated with rainfall or hurricanes.
But the East Coast averaged twice as much flooding.
"When we do reach those threshold we often see sizable amount of flooding", said Gregory Dusek, chief scientist for NOAA's Center for Operational Oceanographic Products and Services.
The study noted floods interfering with traffic in northeast states, swamping septic systems in Florida and choking DE and Maryland coastal farms with saltwater.
Brevard County had four flood days a year ago.
Robert Kopp, a leading climate scientist with Rutgers University, who was not involved in the study, said it confirmed many well-established trends.
"By the time a new 30-year mortgage is paid off in about 2050 the New York City region, which had about 12 days of high tide flooding in 2018, will experience about 55 to 135 days of high tide flooding on average".
We're seeing more instances of flooding in areas like Wilmington, Beaufort, and the Outer Banks. We're talking about repetitive flooding that disrupts people's lives on a daily basis.
The report also verified news reports of farmland salting in coastal Maryland and DE as a result of high-tide flooding.
Record breaking floodwaters, one of the prime warming signs of encroaching sea level rise, caused road closures, loss of business to coastal enterprises and damage to homes and buildings across the U.S.in 2018.
The new report shows high-tide flooding was most prevalent previous year in the Northeast Atlantic region, with records set in the Chesapeake Bay.
The agency forecasts sunny-day flooding this year in Boston at 12 to 19 days (it had 19 last year). There were 10 days a year ago on average in the Northeast, with the city of Washington having 22 days, the study released Wednesday said.