It seems like downward wave reflection might be involved in the transition to NAO+ after this odd SSW. Here are some GFS charts that I think further indicates that this might be the case. Note the downward directed EP-flux in a & eastward phase tilt/vertical wave structure in b-d https://t.co/n4peann1uO pic.twitter.com/BCmkDFwi3g

— Weather is cool (@wxiscool) January 16, 2024