Quick update to this: it does appear the 12/29 extended GEFS run was an outlier in missing Greenland blocking, which more recent ensembles are more bullish on, and accordingly makes that run a warm outlier for much of the US for mid-late January. https://t.co/TxncMjw8aA pic.twitter.com/GaM9NKECdx

— Tomer Burg (@burgwx) December 31, 2023