October @NOAANCEIclimate ERSST has the Niño3.4 SST anomaly at -1.2°C, neutral PDO, and the IOD back to slightly positive. It's extremely unusual to have neither negative PDO nor negative IOD with a La Niña of this amplitude, and this creates challenges for statistical prediction pic.twitter.com/K04ZzHbjqG

— World Climate Service (@WorldClimateSvc) November 3, 2020