After this next storm system exits the Great Lakes in a couple of days, cold arctic air is going to gradually return to the Eastern U.S., and especially the upper Midwest and Great Lakes.

The 8-day forecast for Thursday night (next week) has -50 deg. F temperatures knocking on the door in Minnesota, and below-freezing temperatures pushing into northern Florida. Awesome GFS model forecast imagery (paywalled) courtesy of our friends at WeatherBELL:

Time to fire up your SUV, sacrifice the groundhog, or something.