This is confirmation that the arctic oscillation (AO) with be going negative. And that is what allows for arctic air masses to invade the mid-latitudes.
Now I am a bit obsessed with atmospheric and oceanic oscillation patterns. And this is my favorite blocking pattern of all, the North Atlantic Oscillation (NAO). When it is positive it's typically warm and dry across the eastern US and Europe. But when it's negative it means colder and wetter weather for both, and in the winter it usually signals coastal storms with snow. If both the AO and NAO are negative at the same time it has winter written all over it. And look at the NAO chart:
Oh yeah. This is the start of winter, and I see snow making opportunities up and down the appalachians and even natural snow by next week. Finally.