Quick look at how the tropospheric flow anomalies so far this winter have destructively interfered with the mean stationary waves, helping supress wave activity & contribute to a strong stratospheric vortex. Contrast with same stage last winter, when a major SSW occurred. https://t.co/HEeJIqYjsQ pic.twitter.com/xmLYT6ZVdO

— Dr Simon Lee (@SimonLeeWx) January 20, 2022