When the Polar Vortex is in a weakened state, a jet stream wobble sending polar air into the mid-latitudes becomes more ...

One of the key players in these dramatic shifts is something called the polar vortex. The polar vortex is a massive area of cold air located high in the atmosphere, typically spinning over the ...

The vortex is essentially an area of low pressure in the upper layers of the atmosphere over the polar region up north. This ...

The weather flow is gradually changing now and as we head into early February. Our storm systems will come from the west and ...

The cold air coming in from Siberia ... weekend and the high temperature only reaching 26 degrees Monday. The polar vortex is a large area of low pressure and cold air that always exists in ...

Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...

As we continue to warm moving into February, it appears latest trends suggest a classic "what goes up, must come down" type ...

SALT LAKE CITY — Cities across the U.S. are bracing for cold temperatures as a polar vortex arrives, bringing temperatures down to much below normal for mid-to-late January. Parts of Utah are on ...

Midwest and finally the East in the coming days as arctic air dips down into the Lower 48 for a spell. The mere mention of the term "polar vortex" can set your head spinning (and maybe eyes rolling).

A polar vortex that will bring in extremely and dangerously cold temperatures and wind chills to the metro St. Louis area starting Sunday and into Wednesday. By Monday morning some overnight lows ...