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NOAA's Climate Prediction Center (CPC) announced Thursday that water temperatures in critical parts of the Pacific Ocean had finally reached the threshold required for La Niña to emerge in December.
The weak La Niña is forecast to stick around through April before yielding once again to so-called neutral — not La Niña or El Niño — conditions, according to the Climate Prediction Center.
La Niña is marked by sea-surface water temperatures in a key area of the eastern Pacific. (Image: NOAA/CPC) La Niña typically has the greatest impact on the Northern Hemisphere in the winter ...
An especially strong Walker circulation causes La Niña, which is considered to be the cold oceanic and positive atmospheric phase of the broader El Niño–Southern Oscillation (ENSO) weather phenomenon, as well as the opposite of El Niño weather pattern, [19] where sea surface temperature across the eastern equatorial part of the central ...
A transition to ENSO-neutral, a cycle between El Nino and La Nina weather patterns, is likely during March-May 2025, the CPC said, adding that there is a 60% chance of this happening.
Southern California had become increasingly arid since late summer 2024, with storm systems predominantly affecting the Pacific Northwest and Northern California instead, as a result of the El Niño–Southern Oscillation (ENSO) shifting from El Niño to La Niña. La Niña conditions had emerged over the tropical Pacific Ocean by December 2024.
The Santa Anas are katabatic winds (Greek for "flowing downhill") arising in higher altitudes and blowing down towards sea level. [7] The National Weather Service defines Santa Ana winds as "a weather condition [in southern California] in which strong, hot, dust-bearing winds descend to the Pacific Coast around Los Angeles from inland desert regions".
La Niña was last in place from 2020 to 2023 — a period of time that included California's driest three years on record. The arid stretch shrank reservoirs to record lows, triggered Southern ...