Below is the reflection index (from Kretschmer and Matthias 2020). Sustained values above 1-1.5 indicate favorable conditions for "wave reflection." This phenomenon reflect upward propagating waves from Siberia that "reflect" back down over Canada due to wind shear. 3/ pic.twitter.com/4ycNCPUlDO

— Jason Furtado (@wxjay) December 26, 2022