I took this screen grab from earth wind map. I believe the arctic vortex is the low pressure system about 3/4s of the way up the screen, which appears to be breaking up as a long blue squiggle.
All I can say is a bloody cold as it feels here in NJ, it's nothing compared to the orange bit.
[UPDATE} Jist read this Wikipedia post which explians that:
1. The Squiggly blue thing is the Polar Vortext
2. It's so bloody cold 'cos the the jet stream is meandering South.