A rather strong subseasonal signal is building for a legit -NAO after Christmas. Slow moving WP MJOs (like we have now) that occur during La Nina are much more likely to produce -NAO & disrupt the stratospheric polar vortex

See https://t.co/usgfR7N8Fwhttps://t.co/yoMdo3obVR pic.twitter.com/ZxRl1T8URT

— Eric Webb (@webberweather) December 6, 2021