Josie Taylor | February 21, 2022
According to a new government report, the US coastline will see sea levels rise in the next 30 years by as much as they did in the entire 20th century. The projected increase is especially alarming given that in the 20th century, seas along the Atlantic coast rose at the fastest clip in 2,000 years.
By 2050, seas lapping against the U.S. shore will be 10 to 12 inches (0.25 to 0.3 meters) higher, with parts of Louisiana and Texas projected to see waters a foot and a half (0.45 meters) higher, according to a 111-page report issued Tuesday by the National Oceanic and Atmospheric Administration and six other federal agencies.
The report did have some good news, like the worst of the long-term sea level rise from the melting of ice sheets in Antarctica and Greenland probably won’t kick in until after 2100.
The report “is the equivalent of NOAA sending a red flag up” about accelerating the rise in sea levels, said University of Wisconsin-Madison geoscientist Andrea Dutton, a specialist in sea level rise who wasn’t part of the federal report. The coastal flooding the U.S. is seeing now “will get taken to a whole new level in just a couple of decades.”
The reason why sea level rises more in some places than others is because of sinking land, currents and water from ice melt. The U.S. will get slightly more sea level rise than the global average.
While higher seas cause much more damage when storms such as hurricanes hit the coast, they are also becoming a problem on sunny days.
Cities such as Miami Beach, Florida; Annapolis, Maryland; and Norfolk, Virginia, already get a few minor floods a year during high tides, but those will be replaced by several “moderate” floods a year by mid-century.