La Niña is expected to return this winter and that could reshape the season across the United States. With a 71% chance of developing by December, this powerful climate pattern may bring colder air, more snow, and extreme weather to many regions.
What is La Niña?
La Niña is a natural climate pattern marked by cooler-than-average ocean temperatures in the central and eastern Pacific. It’s part of the El Niño–Southern Oscillation (ENSO) cycle, which flips between:
- El Niño: Warmer Pacific waters, often milder winters in the U.S.
- La Niña: Cooler waters, often stormier, colder conditions in northern states
- Neutral: Ocean temperatures near average, less predictable patterns
Even small shifts in ocean temperature can disrupt the jet stream, changing storm tracks and temperature patterns across the globe.
RELATED: La Niña in New York
Where La Niña has the biggest impact in the U.S.
Colder, snowier conditions in the North
La Niña typically pushes the jet stream north, which allows Arctic air to dip into the northern U.S. This often leads to:
- Colder-than-normal winters in the Upper Midwest, Northern Plains, and interior Northeast
- Above-average snowfall in many northern states
- Greater risk of polar vortex disruptions, sending frigid air deep into the U.S.
Stormy, wet South
While the North turns colder, the South often gets wetter:
- Gulf Coast and Southeast states tend to see more rain and severe weather
- Increased chance for flooding events, especially in late winter or early spring
Dry and mild in parts of the West
The Pacific Northwest and parts of California often see:
- Below-average precipitation
- Warmer and drier-than-normal conditions
- Continued drought concerns in already dry regions
Recent La Niña years show a clear pattern
Past La Niña winters often bring dramatic weather shifts:
- 2022–23: Buffalo, NY, saw a record lake-effect snowstorm; Texas endured a severe Arctic blast
- 2017–18: The Midwest saw snow into late April; the South experienced multiple tornado outbreaks
- 2010–11: California had one of its driest winters on record, while the Northeast was buried in snow
This variability is typical of La Niña — especially when combined with a wobbly polar vortex, which can send deep freezes far south with little warning.
How strong will this La Niña be?
According to NOAA’s Climate Prediction Center:
- There is a 71% chance of La Niña forming by December
- The event is likely to last through winter and could stretch into early spring
- If strong, the U.S. could experience more extreme cold snaps and powerful storms throughout the season
Forecasters say the jet stream could shift frequently, creating volatile weather patterns not always visible in the broader seasonal outlook.
What to expect region by region
| Region | Expected Impact in La Niña Winter 2025 |
|---|---|
| Northeast | Colder, more snow inland; rain near the coast |
| Midwest | Frequent Arctic blasts; above-average snow |
| South | Wet conditions; more severe storms and tornado risk |
| West Coast | Drier in the north; southern areas vary |
| Pacific Northwest | Likely below-normal precipitation |
| Alaska | Typically cooler with heavier snowfall |
What happens next?
Meteorologists will continue tracking Pacific Ocean temperatures heading into October and November. A stronger La Niña could increase the likelihood of widespread winter weather impacts, from icy roads to rising heating bills.
Expect updated forecasts in the coming months as NOAA refines its winter outlook based on real-time sea surface data and jet stream behavior.
This content is brought to you by the FingerLakes1.com Team. Support our mission by visiting www.patreon.com/fl1 or learn how you send us your local content here.