#PolarVortex (PV) fans - what is better than one WAFz upward pulse? Two WAFz upward pulses! This is what GFS is predicting for the remainder of December & should lead to further weakening of the PV. The weaker the PV the higher risk of severe winter weather in January. pic.twitter.com/beAYXz9WuF

— Judah Cohen (@judah47) December 13, 2020