>> oh, yeah. there's -- everyone knows there's the party that's always good. but all the good stuff goes down at the after party, when the real party people get together late night. but we begin with the biting temperatures that are gripping a third of the country right now. more than 100 million of us locked in an icebox right now. >> that's right. windchill advisories have been posted from the dakotas to virginia. it will feel like 50 below zero in northern new england. i can't believe i just said that. 50 below in northern new england. and in new york city, it won't even make it out of the teens. our coverage begins with abc's sam champion. >> reporter: to even the most winter aware, this arctic chill is for real. >> i feel cold, yeah. >> very cold. >> reporter: from the midwest to the northeast, it's the coldest air in two years.