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SST anomaly: ENSO monitoring region
Do sea surface temperatures suggest El Niño or La Niña conditions?  

Colors on this map show where and by how much monthly sea surface temperature differed from its 1981 to 2010 average. Red areas were warmer than average, and blue areas were cooler than average. The darker the color, the larger the difference from the long-term average. White and very light areas were near their three-decade average. Warmer-than-average sea surface temperature across the central and eastern tropical Pacific is one of the indicato...

Where do these measurements come from?  

Every day, instruments on satellites in two different orbits measure sea surface temperature by checking how much energy is radiated by the ocean at different wavelengths. Computer programs plot the measurements from multiple instruments on a gridded...

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