Summer may end on a cooler note for parts of the U.S., with meteorologists suggesting that a weakened polar vortex could ...

Stratospheric warming high above Antarctica could cause the Southern Hemisphere’s polar vortex to weaken at an unusually fast pace over the coming weeks.

It's already a lot to endure frigid winter conditions, but what happens when we get an unwelcome visit from an even colder spell of air like a polar vortex? "A polar vortex is simply that: a vortex ...

Brace yourselves; winter is coming. "Polar vortex" may have been the weather catchphrase of last winter, but it's coming back and it's bringing snow and freezing temperatures along with it. While it ...

The polar vortex is stirring up, bringing the earliest hints that the seasons are changing. When will Wisconsin see its first freeze?

Don't put away those winter coats just yet. An April cold snap is forecast for much of the eastern half of the U.S. early next week, forecasters said, with freezes likely across portions of the ...

CHICAGO (WLS) -- Polar Vortex? Not quite, but Chicago weather is on pace for a cool down next week. "The jet stream will be buckling unusually far south for mid-July, allowing a cross polar flow of ...

CHICAGO (WLS) -- "Polar Vortex" is a dreaded term that we all have become accustomed too over the past few years. But what is it? The polar vortex is always present in the Arctic Circle. It is a broad ...