As per the Euro, the cold air doesn't last long and by the 22nd, we're above freezing again. This is in part due to the jet cutting overtop of the region and a lack of blocking in the Pacific. It almost resembles a -PNA in the west. And instead of a 50/50 Low off the coast of Newfoundland, there's a massive ridge at 192 hrs. There's nothing amazing about this pattern or set-up.
Edit: By 216hrs the entire nation is flooded with warm pacific air while the cold air retreats to the Arctic.