BOSTON—A nor’easter with hurricane-force wind gusts battered much of the East Coast on Saturday, flinging heavy snow that made travel treacherous or impossible, flooding coastlines, and threatening to leave bitter cold in its wake. The storm thrashed parts of 10 states, with blizzard warnings that stretched from Virginia to Maine. Philadelphia and New York saw plenty of wind and snow, but Boston was in the crosshairs. The city tied its record for biggest single-day snowfall, with 23.6 inches, the National Weather Service said. Winds gusted as high as 83 mph on Cape Cod in Massachusetts. Southwest of Boston, the town of Sharon, Massachusetts, had received more than 30 inches of snow by Saturday night, while Islip, New York, and Warren, Rhode Island, both saw more than 24 inches. The wind scoured the ground bare in some spots and piled the snow into huge drifts in others. Forecasters watched closely for …