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Latest ENSO diagnostics: La Niña strengthens
La Niña strengthened during the past month, as indicated by an increasingly prominent pattern of below-average sea surface temperatures across the central and eastern equatorial Pacific Ocean, and is predicted to persist through the Northern Hemisphere winter 2017-18. La Niña is anticipated to affect temperature and precipitation across the United States during the upcoming months.
December 21, 2017
La Niña strengthened during the past month, as indicated by an increasingly prominent pattern of below-average sea surface temperatures across the central and eastern equatorial Pacific Ocean, and is predicted to persist through the Northern Hemisphere winter 2017-18 by nearly all models.
Based on the latest observations and forecast guidance, forecasters favor the peak of a weak-to-moderate La Niña during the winter.
La Niña is anticipated to affect temperature and precipitation across the United States during the upcoming months, with outlooks generally favoring above-average temperatures and below-median precipitation across the southern tier of the United States, and below-average temperatures and above-median precipitation across the northern tier of the United States.
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