The coast of America will see rising sea levels over the next 30 years as well as the entire 20th century, with major eastern cities regularly hit with costly floods even on sunny days, a government report warns.

By 2050, seas off the coast of the United States will rise 10 to 12 inches higher, and in some states of Louisiana and Texas are projected to be one and a half feet higher, according to a 111-page report released Tuesday by the National Oceanic and Oceanic Authority. atmospheric research. and six other federal agencies.

“Make no mistake: rising sea levels are waiting for us,” said Nicole LeBeauf, director of the National Oceanic Service NOAA.

The projected growth is particularly alarming, given that in the 20th century the seas along the Atlantic coast rose the fastest in 2,000 years.

LeBeauf warned that the cost would be high, noting that much of the U.S. economy and 40% of the population are along the coast.

However, the worst of long-term sea level rise as a result of melting ice sheets in Antarctica and Greenland is unlikely to happen by 2100, said Ocean Service oceanographer William Sweet, lead author of the report.

Warmer water is expanding, and melting ice sheets and glaciers are adding more water to the world’s oceans.

The report “is the equivalent of NOAA sending a red flag” to accelerate sea level rise, said Andrea Dutton, a geoscientist at the University of Wisconsin-Madison, a sea level specialist who was not included in the federal report. Coastal floods, which are now observed in the United States, “will reach a whole new level in just a couple of decades.”

“We see this freight train going more than a mile,” Datan said in an email. “The question is whether we will continue to let the houses into the ocean.”

Sea levels are rising higher in some places than in others due to the sinking of land, currents and water from melting ice. The U.S. sea level rise is slightly higher than the world average. And the biggest growth in the U.S. will be on the Gulf Coast and the East Coast, while the West Coast and Hawaii will suffer less than the average, World said.

For example, by 2060, sea levels are expected to rise nearly 25 inches in Galveston, Texas, and just under 2 feet in St. Petersburg, Florida, while only 9 inches in Seattle and 14 inches in Los Angeles. the report said.

While higher seas cause much more damage when storms such as hurricanes break off the coast, they become a problem even on sunny days.

Cities such as Miami Beach, Florida; Anapolis, Maryland; and Norfolk, Virginia, already receive several small “unpleasant” floods a year during high tide, but by the middle of the century they will be replaced by several “moderate” floods a year that damage property, the researchers said.

“These will be areas that have not been flooded, but will start to flood,” Svit said in an interview. “Many of our large metropolitan areas on the east coast will be at increasing risk.”

The report says the west coast of the Gulf of Mexico should suffer the most with the highest sea level rise of 16-18 inches by 2050. Which means more than 10 floods that damage property on a sunny day, and one “big” flood with a high sea level event a year.

In the eastern Gulf of Mexico, sea levels are expected to rise by 14-16 inches by 2050 and three moderate floods on a sunny day a year. By the middle of the century, the southeast coast should raise sea levels by 14 inches and four moderate floods on a sunny day a year, while the northeast coast should receive sea levels rising 10 inches to a foot and six moderate floods on a sunny day a year. .

Both in Hawaii and on the southwest coast by the middle of the century we should expect sea level rise of 6-8 inches, and on the northwest coast – only by 4-6 inches. The Pacific coast will receive more than 10 minor floods on a sunny day a year, but only about one moderate one a year, and in Hawaii – even less.

And that’s only until 2050. By the end of the century, the report predicts that in the United States, the average sea level rise is about 2 feet – more in the East, less in the West.

Program for viewing sea level rise: Look at projected sea level rise in any coastal location up to 6 feet of flooding as a result of floods, hurricane storm surges, tides.

Copyright © 2022, Associated Press. All rights reserved.

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