You might want to familiarize yourself with this chart before the weekend:
We will be comfortably (!) in the -20 to -35 zones on Saturday afternoon and night. As the temperature nears zero in the afternoon, the winds will be gusting to over 20 MPH. There is no question that Wind Chill Warnings will be announced for Saturday and Saturday night.
Boston is supposed to see its coldest day in 12 years; NYC expects to see its coldest day in 22 years.
Also, we're continue to be intrigued by a Monday night/Tuesday/Tuesday night snow/sleet/rain storm. Current liquid precipitation predictions for this event are between half an inch and 1 inch. That's 6-12 inches if it stays all snow, which does not seem likely at the moment.