Stream NBC 5 for free, 24/7, wherever you are. When the polar vortex begins to wobble and allows arctic air to spill south into northern Illinois in January, we usually end up with dangerously ...

When the polar vortex begins to wobble and allows arctic air to spill south into northern Illinois in April, it can lead to chillier temperatures in the 30s and 40s. The city still averages 1.2 ...

Credit: Mashable Rockford, Illinois, is expected to set a record ... Credit: Mashable Along the East Coast, this visit by the polar vortex will be like a houseguest who comes into your home ...

The cause of the week-long deep freeze? A polar vortex collapse. Now, meteorologists are calling for another collapse in the middle of March, one that could plunge the U.S., Canada, and parts of ...

The polar vortex has taken on an unexpected pattern this winter — one that’s made part of the United States the most unusually cold place on the planet, at least so far this year. While the ...

"The large polar vortex disruption from the second week of March is playing a key role in next week’s eastern US cold snap," meteorologist Judah Cohen of Atmospheric and Environmental Research told ...

The Polar Vortex in the upper atmosphere has disintegrated after the intense warming of the stratosphere in mid-March. Currently, its remains are traveling eastward across Canada to the United States.

"The large polar vortex disruption from the second week of March is playing a key role in next week’s eastern US cold snap," meteorologist Judah Cohen of Atmospheric and Environmental Research told ...