Mtn torque events, like this one over E Asia, play a crucial role in fluxing angular momentum poleward from the tropics to the mid-latitudes. The preceding build-up of westerly momentum in the tropics means this E Asia Mtn Torque signals a pattern change in the N Pac in early Jan pic.twitter.com/2QOKaDCBjH

— Eric Webb (@webberweather) December 26, 2021