Figure update: the occurrence of a single SSW (filled marker) or double SSW (filled marker with double circle) as a function of NDJ-averaged QBO50 phase and Nino 3.4 (blue for La Nina, red for El Nino). Pink dot is ND-averaged values for 2022 (this winter). A few comments: pic.twitter.com/PO81LYLxBL

— Dr. Amy H Butler (@DrAHButler) January 5, 2023