2/This is likely to perturb the #polarvortex (PV) in early October as seen by GFS forecast of warming and ridging near Alaska in the polar stratosphere and stretching of the PV. This could lead to some colder weather in Asia and North America but highly speculative for now. End. pic.twitter.com/ncpgPcEMFs

— Judah Cohen (@judah47) September 27, 2021