La Niña has officially formed, marking a shift in climate patterns that was first anticipated last summer, according to federal climate scientists.
This weak La Niña is expected to last until spring, with a transition to ENSO-neutral conditions projected between March and May 2025.
La Niña is characterized by cooler-than-average ocean temperatures, which can significantly influence global weather patterns.
Despite its arrival, the effects on U.S. winter weather are expected to be minimal, with forecasts indicating dry conditions in the southern U.S. and wetter conditions in the Northwest.
Overall, predictions remain consistent with prior seasonal outlooks, and any change in conditions is not expected to be profound.