WAVES, N.C. (AP) — Some of the most fragile islands in the continental United States are preparing for the latest swipe from this year’s devastating hurricane season.

The North Carolina Outer Banks were only getting a glancing blow as weakening Tropical Storm Maria was forecast to move about 150 miles (240 kilometers) offshore Wednesday. But officials warned that severe beach erosion was likely there and along the mid-Atlantic coast.

Texas, Florida, several small Caribbean islands and Puerto Rico have all seen worse this year. Puerto Rican officials said electrical power may not be fully restored for more than a month after the grid was destroyed by Maria’s Category 4 hurricane winds last week. More than 3 million of the island’s U.S. citizens still lack adequate food, water and fuel.

In North Carolina, officials warned the surge of ocean water and waves from Maria would overwhelm island sand dunes from both sides Wednesday, likely cutting the only road to and from Hatteras Island. Bulldozers were already in place to push the sand off the highway when water subsides.

Maria is predicted to erode more than half the dunes along North Carolina’s 300-mile (485-kilometer) coast. Beaches in Maryland and Virginia could fare even worse, with two-thirds seeing erosion and the ocean washing over the dunes on one-third of them, according to the U.S. Geological Survey.

The forecast flooding forced more than 10,000 visitors to leave their beach vacations on the North Carolina barrier islands of Hatteras and Ocracoke. On Tuesday, water was already punching through dunes and under homes built several feet above the ground.

The evacuation orders didn’t apply to local residents, who are now resigning themselves to economic losses as well as more flood damage after a double pounding by last year’s tropical weather.

Sarah Midgett lost her car during Hermine and her home was severely damaged by Matthew’s floods. After the dunes got hit by Jose this month, Maria pushed through the weakened natural barrier Tuesday, washing over parts of Hatteras.

“It’s insane how much the beach has eroded,” said Midgett, who moved many of her belongings off her floor, just in case.

Maria weakened to a tropical storm Tuesday afternoon as the winds finally dipped below hurricane strength for the first time in nine days.

As of 5 a.m. Wednesday, Maria was centered about 145 miles (235 kilometers) east of Cape Hatteras and was crawling north at 5 mph (7 kph).

A tropical storm warning was in effect for the North Carolina coast from Bogue Inlet to the Virginia border, and meteorologists said a storm surge could hit from Ocracoke Inlet to Cape Hatteras.

Hurricane Lee, meanwhile, was gradually strengthening far off in the open Atlantic, where it was expected to swing north and east again before tropical storm-force winds reach Bermuda.

President Donald Trump agreed Tuesday to waive the usual requirement that state governments pay a fourth of the cost of disaster aid, since Maria hit a U.S. territory already mired in financial crisis. Puerto Rico Gov. Ricardo Rossello said he’s “confident the president understands the magnitude of the situation.”

Federal agencies also announced how they’re helping.

The Federal Highway Administration is assessing road damage to facilitate federal money to fix them. The TS Kennedy, a former commercial freighter used by the Maritime Administration for training, is moving from Texas to support recovery efforts in Puerto Rico and the U.S. Virgin Islands.

The Federal Transit Administration is helping restore ferry service, which has been available only during daylight hours to transport emergency supplies to Vieques and Culebra.

And the Federal Aviation Administration’s reservation system has facilitated nearly 100 daily arrivals and departures at San Juan’s Luis Munoz Marin International Airport, including military and relief operations and more than a dozen commercial passenger flights.

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