The crazy thing is that, even though the trough is in the west, they aren't really below average, much, if at all. The whole nation is warm. So is Europe. Makes me wonder if weather modification is a real thing. This is definitely helping reduce the stress on the limited natural gas supplies. Shove all the cold in to Siberia and northern China. It's exactly the kind of scenario that would be the most beneficial for Europe and the U.S. at exactly the right time of the year.
It's probably just coincidence.