Polar vortex?

I see what you're getting at and a cooler American continent does usually mean the jet stream over the Atlantic goes into overdrive, with the difference in surface temperatures between the the U.S/Canada and the Atlantic.
We can already see this with the strong jet over northern Pacific coming off snow covered Asia.
A strong jet stream usually means more storms are made and blown our way.

Then you mention the polar vortex. This is an area of low pressure high up in the stratosphere above our 500hPa level of high and low weather systems.
Now the air in low pressure systems spin in an anticlockwise direction and air in high pressure spin in a clockwise direction. So usually what we want in this part of the world for a cold snowy winter is weather coming from the east and the pressure systems in the strat do usually influence the pressure systems underneath. So what we try to look here for is a strat high pressure over us to generally guide systems underneath to go east to west to get weather from the east.

Here is the 30hPa (the lower the pressure the higher in altitude above the earth) from this mornings chart. Showing the polar vortex in blue and high pressure in yellow/ red.


Now this is a chart from a previous run (current run not fully loaded) and according to this high pressure is trying to build over us on the 25th.


These charts change and flip every day as no computer model is 100% and they react to the current days weather.