(1/n) Thought I'd update this plot since I'm getting retweets of older versions. I've added/changed some things; here using NDJ QBO 50 hPa and Nino 3.4 from CPC. Solid dots = corresponding winters (Nov-Mar) with SSWs, empty dots = winters with no SSWs. SSW = sudden strat warming. pic.twitter.com/O2SYk4oPwx

— Dr. Amy H Butler (@DrAHButler) October 26, 2021