
El Niño Phenomenon
How Pacific sea-surface warming changes rainfall, monsoon, and seasonal weather risks.
El Niño is a recurring warming of the central and eastern tropical Pacific. It shifts atmospheric circulation and can change weather risks far beyond the Pacific basin.
Signals to track
- Niño 3.4 sea-surface temperature anomalies.
- Trade wind weakening and convection moving eastward.
- Regional rainfall and temperature departures.
Fuente: Wikimedia Commons El Niño regional impacts map · Actualizado 2026-07-29