![Animation of sub surface temperatures at the equator in the Pacific showing the deep pool of cooler water in the East](/sites/default/files/2024-08/enso-blog-subsurface-equatorial-pacific-ocean-temperature-anomalies-2024-08-08.gif)
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Beneath the surface of the tropical Pacific Ocean at the equator, a deep pool of cooler-than-average (blue) waters has been building up throughout the summer to date (June 7-August 1, 2024). This pool of relatively cool water is a key factor behind the prediction for La Niña later this fall and winter. NOAA Climate.gov image, based on analysis from Michelle L'Heureux, Climate Prediction Center.