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.

Quelle: Wikimedia Commons El Niño regional impacts map · Aktualisiert 2026-07-29

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