BOSTON—Gusty winds and falling temperatures plunged the East Coast into a deep freeze Sunday as people started digging out after a powerful nor’easter dumped mounds of snow, flooded coastlines and knocked out power to tens of thousands. Dangerous wind chills fell below zero in many locations across the region after the storm dumped snow from…

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…