CPC / NOAA · North American Multi-Model Ensemble

NMME ENSO Plumes

Model-by-model ENSO forecast Array, across two indices — Niño 3.4 and RONI — and two calibrations Original/Rescaled .

Normal = original model output · Scaled = amplitude/bias-corrected ("rescaling") so every model's spread is comparable.

RONI only became CPC's official ENSO index in February 2026.

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