Modeling busted on the intensity/duration of high-latitude blocking signals (-NAO/-AO) for this period. -EPO driving CONUS cold. If this AO/NAO tendency in modeling continues into winter as it has the past few years it could mean inherent cooler biases are possible in LR data. pic.twitter.com/PXSltlf0zE

— Bret Walts (@BretWaltsWx) October 20, 2020