If we look at the entire #QBO dataset from the University of Berlin, we get coverage from 1953 - present. We can develop the following criteria for a 2021-22 #winter analog set:

1) Sept 30mb QBO anomaly < 0
2) Descending -QBO through December
3) La Nina by ONI definition

— Ethan Sacoransky (@blizzardof96) October 26, 2021