NOAA expands scale limit as Super El Niño nears record strength

The 2026–2027 El Niño is accelerating toward historic intensity, with the latest data showing sea surface temperature anomalies in the key Niño 3.4 monitoring region reaching +1.8°C — just 0.2°C below the +2°C threshold that defines a "very strong" event. NOAA has raised the maximum limit on its subsurface temperature anomaly map to 8°C, underscoring the extraordinary heat building beneath the Pacific Ocean's surface.yourweather

The development marks a rapid escalation from just weeks ago. The relative anomaly jumped from +1.5°C to +1.8°C in a single week, while the Niño 1+2 region off Peru's coast has already reached a 3.3°C relative anomaly — an exceptional value for this stage of development. Climate Impact Company reported in early August that the Southern Oscillation Index dipped to -2.68 in July, passing the -2.50 "super" El Niño threshold.climateimpactcompany+1

Forecasts Push Into Record Territory

Long-range models now project peak anomalies approaching +4°C in the main ENSO region by late 2026, which would make this the strongest El Niño since modern tracking began in 1979. Each successive forecast run from ECMWF and the NMME multi-model ensemble has trended stronger since February, with the latest runs pushing above all previous Super El Niño events on record.severe-weather

The event's rapid growth is being driven by record-breaking westerly wind anomalies across the equatorial Pacific — the strongest in 86 years of ERA5 data for the June–July period — which have generated a powerful subsurface Kelvin Wave with peak anomalies exceeding 9°C below the surface. NOAA's Climate Prediction Center has stated there is a 97% chance El Niño will persist through early spring 2027.cpc.ncep.noaa+1

MJO Pulse Could Push Past Critical Threshold

An incoming pulse of the Madden–Julian Oscillation is forecast to propagate across the Pacific in coming weeks, a development that could weaken trade winds further and help transfer subsurface heat to the surface. With Niño 3.4 already at +1.8°C, forecasters expect this mechanism could push the event past the +2°C "very strong" threshold within days.yourweather

NOAA updated its hurricane season outlook on August 5, noting the "Super El Niño" is expected to suppress Atlantic tropical activity while creating atmospheric conditions unfavorable for hurricane development. For the coming winter, forecasts indicate a sharp amplification of the jet stream, with an active storm track across the southern United States and warmer conditions over Canada and northern states.foxweather+1