A lot of talk about possible vortex weakening recently but recent forecasts have backed off a bit. Compared to last year at this time, which was a record weak vortex at 70hPa, the vortex looks to be only slightly weaker than normal to me.🤷🏻‍♀️ pic.twitter.com/Djtb02yY7q

— Dr. Amy H Butler (@DrAHButler) September 25, 2018