As the polar vortex begins to stir, subtle clues point to the coming seasonal shift. So, when will freezing temperatures arrive in Indiana?

The polar vortex is one of Earth’s most powerful climate systems and scientists believe it may be collapsing. This could trigger extreme weather shifts and possibly even a new ice age. In this video, ...

Temperatures are staying relatively warm throughout Illinois this week, despite fall officially starting Sept. 21. But ...

The polar vortex is beginning its seasonal strengthening, signaling a gradual shift toward cooler weather. Frost advisories were issued in parts of the Great Lakes region, New York, and New England as ...

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 ...

The polar vortex is stirring up, bringing the earliest hints that the seasons are changing. That shift is most noticeable in northern Wisconsin, where a frost advisory was in effect early Monday, Sept ...