Latest CFS forecast moves up timing of a significant #PolarVortex (PV) disruption from January to December. Normally I don't consider long range PV model forecasts reliable but is this one different? And what are the possible implications for the #winter? https://t.co/9ZWSlvqUI6 pic.twitter.com/LNiQm1ylHE

— Judah Cohen (@judah47) November 19, 2018