Looking at 10hPa and seeing our 5th warming and hints for a 6th round 360H(GFS). #PolarVortex has a lot to deal with and remains under attack #SSW@judah47 @WinterExpert @deanhall30 @FrenchScotPilot @Forecas55175638 pic.twitter.com/MYIweqHCNL

— Harry Spoelstra (@HarrySpoelstra) January 10, 2019