Meteorologists warn that the coldest burst of Arctic air this season is coming to put an icy and prolonged exclamation point on America's winter of repeated polar vortex invasions starting this weekend.

Threat level: The Arctic air is likely to send temperatures plunging to at least 30 degrees below average for mid-February across the Midwest and Plains states, with the cold moderating some as it barrels east through late week.

Ben Noll, The polar vortex is coming back. After a half-month hiatus, frigid air will again surge across the United States beginning this weekend through next week, as the

We are tracking the return of the polar vortex next week as a wavy jet stream brings a blast of Arctic air to the Great Lakes.