Powerful waves lashed homes and swept away a cabin on January 10, as the US East Coast grapples with a fierce storm that has set off power outages, floods and grounded flights.A video taken at Owls Head, Maine shows a cabin being swept away by floodwaters during a storm battering the shore.More than 50 million people from eastern Ohio up through the Mid-Atlantic and into the Northeast were under high wind and flooding advisories on Wednesday, the National Weather Service (NWS) said.Some 300,000 homes and businesses from North Carolina to Maine were without power on Wednesday afternoon, Poweroutage.us reported.