Sea level data from a satellite launched by NASA and European partners shows that a swell of warm water hundreds of miles wide has arrived in the Pacific Ocean off the coast of South America, a sign that El Niño will likely emerge later in the year. Because water expands as it warms, a rise in elevation of an area of the ocean indicates increasing ocean temperatures.
El Niños can cause heavy rains in some regions and deficits in others, influencing daily life and commerce around the world.
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by Joji Xavier
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