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Tracking El Niño Site Map
Kelvin Wave

Sea surface temperature animation

The birth of El Niño. This animation shows anomalies, or departures from normal, in Sea Surface Temperature (SST) over the past year. As spring became summer in 1997, a Kelvin Wave of warm water crossed the Pacific and accumulated off the coast of South America, shown here in red. Click on your browser's reload button to see the animation again.

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Animation: NOAA

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