Just my thoughts but haven’t the models especially the GFS showed decent cold set ups in the past at this time of year, especially late year. Could it be that the models find it hard to interpret how the intensifying cold to the north will interact with the jet and as a result we get quite a few cold options showing which decreases as December starts and the models have a better idea.
Just my observations looking at the charts over the years.
Originally Posted by: roadrunnerajn