What's setting up at 500mb next 2-weeks is a quasi-stationary 4-wave pattern. Not ideal, esp. Mid-Atlantic on south. Textbook east-based La Niña / -PDO / -QBO trio creating feedback w/slow MJO progression and NPAC anticyclonic wave breaking. Result? Persistent west coast trough. pic.twitter.com/808EaHl0pJ

— Chris Martz (@ChrisMartzWX) December 24, 2021