Boston could see a rash of flooding in the coming years from climate change – The Boston Globe | Climate Change

Water from Boston Harbor flooded Boston’s Long Wharf during high tide in 2018Craig F. Walker/Globe Staff


could see as many as 18 high-tide flooding days in the coming year, the National Oceanic and Atmospheric Administration predicted, while renewing its forecast that the number could grow to as many as 35 by 2030 and 95 by 2050.

In the past meteorological year, which ran through April, Boston saw 11 high-tide flooding days, coming in on the low side of NOAA’s projection for both years of 11 to 18 such days. The past year’s number was still nearly twice as high as what was normal 20 years ago.

The record for such flooding was set in 2017, when high tides inundated parts of the city on 22 days, more than any other community on the East Coast.

The predictions came in a new annual report from NOAA, “2021 State of High Tide Flooding and Annual Outlook.

NOAA defines high-tide flooding, also known as sunny-day flooding, as water rising about 2 feet above the typical daily high tide. As sea levels rise, damaging floods that used to occur only during storms now happen more regularly, such as during a full moon or with a change in winds or currents. Average sea levels have risen by about a foot over the past century.

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