Here is the forecast radar and areas where temperatures are below freezing (blue line) for 10am EST tomorrow.
The airports from Philadelphia to Boston should be a mess in the morning with numerous flight delays. Things will improve in the afternoon. Snow is likely from northern Upstate New York through Maine with a really messy mix in southern Maine.
The Central U.S. gets a break.
Weather will be improving in Seattle after a windy, rainy night but conditions are likely to cause delays in Portland.