.....Most recent GFS forecast run (12z) does have main event #PolarVortex (tropospheric version) visiting from its breeding ground in the cold Arctic.
— Ryan Maue | weather.us (@RyanMaue) December 5, 2017
Ridge/trough wave train amplified / reinforces over period of next 10-days. That cyclonic wrap-up over Quebec is stunning pic.twitter.com/fl2nkfDjOf