Yes, kudos to @bluewavefor being specifically all over the jet extension and the modeled propagation of the MJO being biased fast. I expected a mild December, but didn't specifically highlight the jet extension and took the bait on the flip around the holidays. I don't think it changes much in the grand scheme of things, but it may cause December to finish a bit warmer than my predicted +1 to +3F range for the mid atl and NE. We shall see.
Its not too surprising in hindsight considering that essentially a colder version of 2015-2016 has always been the expectation.