December 2021: this forecast of stratospheric temperature anomalies is pretty unusual 🔴

How unusual? The zonal mean anomaly between 60-90˚N is the *2nd warmest* predicted by @ECMWF (from September) compared to all years from 1993-2020.

🧵 Thread: winter forecast tea leaves 🌿 pic.twitter.com/zrs1u7iAKP

— Ben Noll (@BenNollWeather) September 18, 2021