As a large, powerful winter storm passes north into Nova Scotia, cold weather is sticking around in the Northeast."An arctic outbreak will keep temperatures 20 to 30 degrees below average across the northeastern U.S.," the National Weather Service says.The "bomb cyclone" that raked up the East Coast in the middle of this week left behind snow, ice and damaging coastal flooding. National Guard units were mobilized in multiple states, and officials urged people to stay off the roads if they could, as many regions experienced high winds and near zero visibility.But the end of the storm doesn't mean the end of the danger."While conditions have begun to improve across the northeastern U.S., the arctic surge is already underway accompanied by brisk winds at times," the NWS weather forecast says. "Dangerously low wind chill temperatures are to be expected the next couple of days with some blowing snow possible. "Many regions in New England, the Midwest and the southern U.S. might be breaking daily temperature records in this cold snap.Counting wind chill, parts of New England could feel as cold as minus 30 degrees, The Associated Press reports: