cold. we heard about this polar vortex. the reason it's so cold outside in the midwest is we have windchills below 40 below in green bay. 41 below at this hour. the cold air escaped from the north pole. a piece of it is rotating around. i'll set this into motion. you see the white area there is core of most frigid air by tomorrow. tuesday over the northeast and great lakes. today it felt like spring this morning in the northeast. tomorrow it will definitely feel like winter. dangerous windchills move into our area as well. and let's look at these warnings. you can see a tremendous amount of real estate covered by windchill warnings and advisories all of the way from montana down through florida. 35 states are under a windchill advisory at this hour and windchills remain brutal across the midwest. now the arctic front pushes into the southeast. it feels like 12 degrees in atlanta. even new york city starting to see windchills creep down to 30s and it feels like 9 below in pittsburgh. nashville feels like 1 degree