If we don't climb out of this -MVP, MJO Phase 7 & 8 won't be a driver for US Cold, per Schreck et al. (2013). See bottom 2 composites. Phase 7 & 8 are cold when MVP is neutral for Phase 7 and positive (>0.75) for Phase 8. Notice -MVP in Phase 5 is warm east (we just left Phase 5) pic.twitter.com/Srdag13nJX

— Dr. Jonathan Wall (@_jwall) January 15, 2020