NOAA has declared that a La Niña is underway across the Pacific - an event that could have wide-reaching implications for weather patterns across the country through the remainder of fall and into the upcoming winter.

According to the agency, the negative phase of the El Niño-Southern Oscillation, or what is commonly referred to as ENSO, began in September when water temperature anomalies in critical parts of the central and eastern Pacific dropped below the threshold of -0.5 degrees Celsius.

The impacts of La Niña across the country are well known, with the southern tier of the U.S. generally experiencing drier and warmer-than-normal conditions, while the northern tier often sees cooler and wetter weather.

The last La Niña event officially ended in 2023, and during the two years since,

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