The early season polar outbreak continues over most of the U.S., with snow advisories (purple), winter storm warnings (pink), or lake effect snow watches (light blue) covering portions of at least 24 states:

The geographic extent and longevity of the current cold wave is unusual, with temperatures averaging 10 to 20 deg. below normal over most of the country for the coming work week:

GFS model forecast of 5-day average temperature departures from normal through Friday, Nov. 21, 2014 (Weatherbell.com graphic).

Heaviest snow amounts over the next 5 days will be to the lee of Lakes Ontario and Erie in the lake effect snow belts, where 1-2 feet of snow is possible mainly Wednesday through Friday:

GFS 5-day total snowfall forecast through Friday, Nov. 21, 2014 (Weatherbell.com graphic).

With repeated reinforcements of cold air rotating through the U.S. out of Canada, relief from the winter-like weather is at least a week away.