Satellite shows polar vortex spinning away in Canada and causing waves of frigid air to spill south. It's all headed east and south and most places will feel this snap by late week.
Above - early morning temperatures. Below...expected morning temperatures for this Friday.
Current map showing cold air moving across the Central U.S. Storm on west coast heads to east coast by this weekend.
This map is the gfs model for Saturday night. Storm is near Chicago. Blue is snow..green is rain...pink is ice. Below - gfs model for Christmas Day.
This is for Sunday- 12-25-16 at 7pm. Timing on long range weather is never right. This models shows snow from Ohio Valley to Northeast. Will it be faster or slower. If it speeds up..then a white Christmas is possible in the East. "If" the big word here. For now...get ready for the cold. Be safe.