Extreme cold and snow smacked the Gulf Coast states this week, but the polar vortex may not be to blame.

and the Arctic air moves downstream – southeastward – toward the continental US," Grow Cei told CNET. The polar vortex can be a powerful source of winter weather, but it's not the only cause ...

A blast of arctic ... polar vortex is within the stratosphere. Because of the lack of sunlight, both the Earth's poles have ...

Anytime we get an Arctic air blast down this far south, this is an artifact of the polar vortex rearing its ugly head,” said ...

A blast of arctic ... which causes a powerful jet stream to emerge in the stratosphere and blow the cold air from west to east. This strong circulation is known as a polar vortex.