One other thing...

...these phenomena are called "Polar Vortexes" because they over the POLES of the planet or at least they should be. It has nothing to do with cold. It is a geographical reference. 

90 degrees latitude. 

The Poles of Earth. That is where these air masses belong and are no longer!

It just happens that the air masses at 90 degrees latitude are frigid. The description of Polar Vortex as nothing to do with temperature. It is LATITUDE that determines the name of this DISPLACEMENT.