At 50 hPa, note that the vortex deepens with time and shifts toward Siberia. The ridging over North America in the stratosphere will also subside with time, a key indication of the removal of outside forcing on the vortex. Could be a good recovery coming up in November. pic.twitter.com/Q0T801WQOw

— Jason Furtado (@wxjay) October 18, 2021