The Second La Niña in Two Years is Upon Us

How might it influence our winter weather? One thing's for sure: It's bad news for the drought-stricken West.

ImaGeo iconImaGeo
By Tom Yulsman
Oct 15, 2021 12:30 AMOct 15, 2021 12:42 AM
Sea Surface Temperature Anomalies
In this map showing how sea surface temperatures departed from average on Oct. 14, 2021, a vast swath of anomalous chill extends along the equator west of South America. This is characteristic of the La Niña climate phenomenon. (Credit: Climate Reanalyzer)

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It's official now: After a five-month respite of neutral conditions, the National Oceanic and Atmospheric Administration says the second La Niña in two years is here — and it's already influencing our weather.

"We’ve already seen one likely effect of La Niña this year — a more active Atlantic hurricane season, with nearly twice as many storms as average so far," according to Emily Becker, a climate prediction expert and lead author of NOAA's ENSO Blog. "But the most substantial La Niña effect on North American rain, snow, and temperature happens during winter."

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