Tropical Storm Ernesto became a hurricane again Sunday as it churned away from Bermuda and headed further out in the northeastern Atlantic, sending powerful swells toward the U.S. East Coast, generating rip currents associated with at least one death and prompting many rescues.

The National Hurricane Center in Miami said Ernesto’s maximum sustained winds were clocked at 75 mph (120 kph), just barely Category 1 strength.

More strengthening was forecast over the next 12 hours, with Ernesto then expected to weaken and become a post-tropical cyclone on Tuesday, the hurricane center said. The storm was centered about 520 miles (840 kilometers) south of Halifax, Nova Scotia, and was expected to pass near southeastern Newfoundland late Monday and early Tuesday.

Swells generated by Ernesto were affecting portions of the Bahamas, Bermuda, the U.S. East Coast as well as the Canadian Atlantic coast. Life-threatening surf and rip current conditions are likely in these areas during the next couple of days, the hurricane center said.

The National Weather Service earlier posted a coastal flood advisory and warned of a high risk for rip currents along the Atlantic Coast through Monday evening, saying they “can sweep even the best swimmers away from shore into deeper water.”

A warning extended from Florida to the Boston area and portions of Maine.

In periods of high risk, rip currents become more likely and potentially more frequent, posing a danger to all levels of swimmers, not just inexperienced ones, said meteorologist Mike Lee in Mount Holly, New Jersey.

“It’s going to be really dangerous out in the water today,” he said.

At Manasquan Inlet in New Jersey, officials said a fisherman was washed off the north jetty Saturday but was quickly rescued by lifeguards. The victim had knee and back injuries and a possible concussion and was taken to a hospital, Lifeguard Chief Doug Anderson told NJ Advance Media, and lifeguards rescued at least five other people.

In Ventnor to the south, Senior Lt. Meghan Holland of the city beach patrol said eight people were rescued.

Forecasters, citing local emergency management, said a 41-year-old man drowned Saturday in a rip current at Surf City, North Carolina.

Two men drowned Friday in separate incidents on Hilton Head Island, South Carolina, but it was unclear whether rip currents were involved, The Island Packet of Hilton Head reported, citing a lifeguard services spokesperson.

Separately, heavy rains unrelated to the hurricane caused flooding in parts of western Connecticut Sunday, closing roads, forcing water rescues and causing a minor mudslide. Floodwaters swept two people into the Little River in the town of Oxford, CT Insider reported, but officials weren't able to immediately reach the area because of flooding and had to respond to other emergency calls, said Scott Pelletier, Oxford's fire chief. Pelletier did not respond to a message from The Associated Press seeking additional details.

In Southbury, police asked residents via Facebook to stay home while roads were closed and crews responded to emergencies. In nearby Danbury, city officials said in a statement that a mudslide prompted the evacuation of a home.

Flash flood warnings were posted for parts of Connecticut and southeastern New York, and flash flood watches and advisories were in effect for areas of Delaware, New Jersey and southeastern Pennsylvania.

The rough surf spawned by Hurricane Ernesto contributed to an unoccupied beach house along the Cape Hatteras National Seashore on North Carolina’s Outer Banks collapsing into the water Friday evening. Seashore officials urged the public Sunday to avoid beaches in parts of the village of Rodanthe where “substantial damage” to several oceanfront structures occurred. Debris cleanup was expected over the next several days.

On New York's Long Island, East Hampton Village Mayor Jerry Larsen said beaches were closed to swimmers on Saturday and Sunday because high tides pushed water right up to the base of the dunes “so you can’t really have people sitting on the beach.”

Many people watched the water from the parking lot Sunday, he added.

“It’s quite a sight to see the water coming up almost to the parking lot, and if you think about it that storm was hundreds of miles offshore so it must have been quite powerful,” Larsen said.

The annual fireworks show that draws thousands was canceled Saturday night and again for Sunday night, he said.

Ernesto had weakened to a tropical storm late Saturday after bringing heavy rain and strong winds to Bermuda.

At a press conference Sunday afternoon, Bermuda Security Minister Michael Weeks said the tiny British territory made it through the hurricane without any injuries or major incidents. “I want to express my gratitude to everyone for taking this storm seriously,” he said.

Steady progress is being made to clear the roads and restore power in Bermuda, he added. Businesses were beginning to reopen and airport operations were to resume Sunday.

There were no reports of major damage, said Lyndon Raynor of Bermuda’s Disaster Risk Reduction Mitigation Team. BELCO, Bermuda’s power company, said more than 70% of customers had electricity and more than 7,000 remained without it Sunday.

Ernesto previously battered the northeastern Caribbean, leaving tens of thousands of people without water in Puerto Rico. The national power company LUMA said it had restored electricity to more than 1.4 million customers, but service data Sunday showed more than 61,000 without power.

After cleaning up and removing debris, the Virgin Islands Department of Education said all public schools would resume operations Monday. Public school classes also were slated to start Monday in Puerto Rico, nearly a week after the original opening date.