CHICAGO (CBS) — A Weather Alert will be in effect for Friday and Saturday as another winter storm moves in ... We are tracking the return of the polar vortex next week as a wavy jet stream ...

in Chicago. (AP Photo/Kiichiro Sato) The coldest burst of Arctic air this season is coming to put an icy exclamation point on America's winter of repeated polar vortex invasions, meteorologists warn.

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A polar vortex collapse already took place in February, contributing to a wave of winter storms, particularly in Midwest and Northeast. AccuWeather's lead meteorologist Paul Pastelok said ...

The mid-Atlantic and Tennessee Valley experienced additional bouts of winter weather as the disruption of the polar vortex sent temperatures ... the same shortfall. Chicago and Minneapolis also ...

The coldest burst of Arctic air this season is coming to put an icy exclamation point on America’s winter of repeated polar vortex invasions, meteorologists warn. And it will stay frozen there ...