Even there, cold air bleeding south can contribute to overrunning snow/ice events if the sub-tropical jet turns active. If we do see a PNA spike in January it would turn much colder in the east...it's within the extended GFS/ECM ensemble spread, but on the less likely side. 13/13 pic.twitter.com/4CNNZ1aPUs

— Jim Sullivan (@JimSullivan92) December 23, 2021