In GFS, the current wave-2ish pattern, including a barotropic blocking high over the North Atlantic/Europe associated with the negative NAO, starts to tilt westward with height, along with the Aleutian low, leading to anomalous wave-1 forcing in 2 weeks time. pic.twitter.com/IVX0qoghs0

— Dr. Amy H Butler (@DrAHButler) November 12, 2019