If you watch closely the massive ridge into the higher latitudes actually splits the 50mb #polarvortex for a time via latest FV3 GFS. Where it goes and what it does next really needs watched. GFS has been hinting at this for last few runs. pic.twitter.com/FLcwUbn5WK

— BAM Weather (BAMWX) (@bamwxcom) December 7, 2019