Not sure I can ever recall a pattern like this across the Northern Hemisphere - all wave one (almost looks like +AO but with the polar low over Bering Sea). Should bang on the #polarvortex pretty good; cold, stormy with mountain #snow in western N America & mild in the East. pic.twitter.com/TkcJSxTGX3

— Judah Cohen (@judah47) December 25, 2020