IRI: Weekly Niño 3.4 Anomaly Reaches +3.3°C, Fifth Straight Week Above +3.0°C

IRI/Columbia's weekly update (Oct 19) puts the Niño 3.4 anomaly at +3.3°C for the week centered Oct 14, with central-eastern equatorial Pacific anomalies above +3.0°C for a fifth consecutive week. WMO's Oct 8 update forecasts an Oct–Dec average near +3.7°C, peaking around December.