Eight coastal communities along the East and West coasts reported record high tide flooding last year — a trend expected to continue in 2024, according to the National Oceanic and Atmospheric Administration (NOAA).

The expected strengthening of El Nino will bring even more high tide flood days, the U.S. weather agency said.

The 2023 Annual High Tide Flooding Outlook documents high tide floods between May 2022 and April 2023 at 98 NOAA tide gauges along the U.S. coast.

The outlook also forecasts flood possibilities through April 2024 and decade projections out to 2050.

According to NOAA, high tide flooding occurs when tides reach between 1 to 2 feet above the daily average high tide, depending on location.

Because of rising sea levels, “it no longer takes severe weather to cause disruptive flooding along the coast,” the report stated.

“Communities across the country are seeing more and more high tide flooding, with damaging effects to transportation systems and infrastructure — particularly in our most underserved communities,” said Jainey Bavishi, assistant secretary for oceans and atmosphere and NOAA deputy administrator. “With sea-level rise and a strong El Nino, NOAA’s forecasts are a critical resource for our nation’s communities as they plan and take proactive action to build their climate resilience.”

A record-breaking number of high tide flood days were recorded in 2022 at three stations, the report noted.

On the Southeast coast, Trident Pier, Fla., saw 16 days, two more than in 2020, and Vaca Key, Fla., saw two days, one more than in 2017.

In the Caribbean, Magueyes Island, Puerto Rico, saw two days, which increased from one event in 1998.

Five locations tied previous records.

• On the mid-Atlantic, Kiptopeke, Va., tied its 1997 record, with 11 high tide flood days observed.
• Along the Southeast coast, Fort Pulaski, Ga., observed 13 days, tying its 2019 record.
• Fernandina Beach, Fla., observed nine days, tying its 2015 record.
• On the eastern Gulf, Naples, Fla., tied its 2017 record of three days.
• On the West Coast, Port Townsend, Wash., observed 13 flood days, tying its 1982 record.

NOAA predicts that between May 2023 and April 2024, the U.S. will experience four to nine high tide flood days — an increase from last year’s prediction of three to seven days and about three times as many than typically occurred in 2000.

The expected strengthening of El Nino this year could amplify high tide flooding frequencies along the East and West coasts, the agency stated.

Communities on the mid-Atlantic and Gulf coasts are expected to experience the most high tide flooding, as El Niño conditions will compound the effects of sea level rise in some areas.

For the mid-Atlantic, nine to 15 days are predicted, an almost 350 percent increase since the year 2000.

Along the western Gulf, seven to 14 days are predicted, an almost 350 percent increase since the year 2000.

For the Pacific Northwest, four to 11 high tide flood days are predicted — a nearly 150 percent increase over the year 2000, and for the Pacific Southwest, one to five days are predicted, an almost 100 percent increase since 2000.

NOAA released a new Monthly High Tide Flooding Outlook that estimates the likelihood of high tide flooding for each day in the calendar year, up to a year in advance, at tide gauge locations across the country.

The Monthly High Tide Flooding Outlook does not account for real-time conditions or weather forecasts; however, it provides critical situational awareness about windows of time that have higher flooding risks. As potential flood days grow near, the monthly outlook can be paired with weather forecasts to understand if an upcoming storm event might compound impacts from already elevated water levels.

“The new monthly outlook represents a leap forward in NOAA’s ability to predict high tide flooding at a sub-seasonal scale,” said Nicole LeBoeuf, director of NOAA’s National Ocean Service. “Armed with more precise and timely data, coastal communities can make informed decisions about flooding risks, and take action to mitigate impacts by closing roads, performing maintenance on storm drain systems, and protecting vulnerable infrastructure.”

By 2050, the U.S. will likely experience an average of 45 to 85 high tide flooding days per year, the agency noted.

Long-term projections are based on the ranges of expected relative sea-level rise of about a foot, on average, across the United States by 2050.

Data specific to each NOAA tide gauge can be found on the Annual High Tide Flooding Outlook website.