As @jhomenuk and others have mentioned, we are seeing an MSLP reversal across the arctic. This is why models have a downward trend in the AO forecast. This pattern makes it easier for high latitude ridging(e.g Alaskan) to amplify/stabilize. pic.twitter.com/dOBj4APW5Z

— Ethan Sacoransky (@blizzardof96) January 4, 2019