According to this entry, cold will cover 90%-95% of the US by Boxing Day. Leading up to this there will be atleast 3 if not more storms with the potential of 6+ inches in the Plains over to the Northeast. Especially the mountains across NY, VT and NH. There will also be the potential for snow into Seattle and the PNW next week and of course the Rockies.
Read the whole blog for more:
http://www.accuweather.com/mt-news-blogs.asp?partner=accuweather&blog=Lundberg&pgurl=/mtweb/content/Lundberg/archives/2008/12/cold_taking_no.asp