ALT A graphic with text overlaid on the U.S. La Niña winter impact map. The text reads: "A weak La Niña is less likely to result in typical La Niña winter impacts. However, it could still influence the 2025-26 winter season."

ALT A map of North America showing the typical weather patterns during a La Niña winter. A blue arrow shows the polar jet stream dipping southward over the northwestern U.S., bringing colder and wetter conditions to the Pacific Northwest and northern U.S. A "blocking high pressure" system is shown off the West Coast. The southern U.S. is shown with warmer and drier conditions.

ALT A graphic announcing the issuance of a La Niña Advisory on October 9, 2025. The text reads: "La Niña conditions have been observed in the tropical Pacific Ocean and are expected to continue through the December 2025 to February 2026 timeframe."

ALT A graphic showing a map of the Pacific Ocean with sea surface temperatures. A rectangular box labeled "key monitoring region" highlights a band of cooler-than-average water along the equator, indicating La Niña conditions.

ALT A bar chart titled "ENSO Probabilities, Issued October 2025." It shows the percent chance of La Niña (blue), Neutral (gray), and El Niño (red) conditions for different three-month seasons from September 2025 to July 2026. The chart indicates a high probability of La Niña in the fall, decreasing over time, while the probability of neutral conditions increases beginning in January 2026.

ALT 8-14 Day Temperature Outlook (September 15-21) Maybe showing all 50 states with most colored orange and red - indicating better odds of seeing above normal temperatures. Near to below more likely across the eastern U.S. and northwest Alaska.