Reposted by Matthew Ferreira | MassachusettsWx

50mb U wind anoms this Nov so far (left) compared to NDJF 50mb U wind anom difference b/t -EPO & +EPO cool ENSO neutral & La Niña winters in JRA-3Q & ERA-5 since the 1940s (middle & right).
This has been discussed for a while now, but when west QBO is coupled w/ cool ENSO, it favors -EPO in winter