The equatorial Pacific is the planet's primary weather engine. ENSO shifts rainfall, drought, storm tracks, and global mean temperature across seasonal-to-interannual timescales. Four indicators read the current state: the canonical Niño 3.4 index, the CFSv2 ensemble forecast, the Southern Oscillation Index (atmospheric confirmation), and a real-time SST map.
Tracks: Niño 3.4 Forecast Cone, Niño 3.4 · Equatorial Pacific SST, The Temperature Ratchet, Tropics · ENSO context, Southern Oscillation Index · Walker Circulation.