Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures as tens of millions of residents along the East Coast contend with a thick blanket of snow — and more snowfall in the forecast.Winter storm warnings issued by the National Weather Service were in effect for parts of the Mid-Atlantic through Monday morning, and warnings began in New England on Sunday afternoon. Heavy lake-effect snow was expected in western New York state Monday through Wednesday morning, with 2 to 3 feet possible in some areas including Oswego along Lake Ontario. Return of the Arctic blastSunday snowfall was just the start of a chaotic week of weather. Much of the Eastern Seaboard will be enduring some of the coldest temperatures this winter.An area from the Rockies into the Northern Plains will see colder than normal weather over several days, with temperatures forecast …