It’s taken longer than I initially expected to get this sort of pattern evolution, but it’s finally beginning to take shape on NWP models in early January.

This is a bitterly cold pattern for N America overall, more of a question of when/where rather than if. https://t.co/6DsbgDjKLL pic.twitter.com/QlqHCeIWjS

— Eric Webb (@webberweather) December 25, 2021