A potent shot of Arctic air starts settling in Monday as a massive dip in the jet stream pulls in frigid air across the entire eastern half of the country. Temperatures are set to drop as low as 20 degrees below average Tuesday and Wednesday with highs only reaching the teens, with lows in the single digits and even plunging below zero.

After the snowfall stops, temperatures are going to plummet as Siberian air lunges eastward which means any type of wintry mix and untreated surfaces will turn to ice overnight Sunday disrupting travel on Monday. The colder temperatures expected next week means surfaces are expected to remain icy until the middle of next week.