We're a few days into the 2021 sudden stratospheric warming. The Arctic stratosphere warmed 25˚C (45˚F) in just a few days. This is really a hemispheric event, as the polar stratospheric air warmed/sinks, the tropical stratosphere air cooled/rises.https://t.co/LsgFid9v44 pic.twitter.com/8baWUkOyli

— Dr. Andrea Lopez Lang (@alopezlang) January 8, 2021