Is it too soon to talk about the #PolarVortex (PV)? Well GFS is predicting first minor disruption of PV of the season the second week of October with elongation of PV from Siberia to Canada and negative stratospheric #Arctic Oscillation that favors buildup of #cold air in Canada. pic.twitter.com/HypJZnF3Rc

— Judah Cohen (@judah47) September 26, 2019