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AMERICANALMANAC (Charles McAdams) - Polar vortex weakens after record start as super El Niño clouds U.S. winter forecast

A once record-strong polar vortex has already weakened while a super El Niño dominates winter thinking, and scientists say big surprises could still hit Americans. The polar vortex barreled out of late summer at full strength, then slipped. By early October, the same system that can lock bitter Arctic air in place was stretching and […] The post Polar vortex weakens after record start as super El Niño clouds U.S. winter forecast appeared first on American Almanac .

A once record-strong polar vortex has already weakened while a super El Niño dominates winter thinking, and scientists say big surprises could still hit Americans. The polar vortex barreled out of late summer at full strength, then slipped. By early October, the same system that can lock bitter Arctic air in place was stretching and running a bit weaker than normal, even as a powerful El Niño steered the seasonal conversation toward a milder winter for much of the country. USA TODAY reported that forecasters are watching both drivers at once and are still not ready to lock in a full winter outlook. The mix leaves households from the West Coast to the eastern United States guessing how hard the cold season will hit. MIT climatologist…Open

What historical data did Amy Butler provide regarding previous strong El Niños and the polar vortex?
NOAA atmospheric scientist Amy Butler noted that the three previous strongest El Niños did not bring polar vortex disruptions. This highlights the uncertainty in the relationship between the two phenomena, as a strong El Niño can raise questions about how much the stratosphere will matter in the coming months.
Q&A ID 058bb064-1eaa-4a1c-a4aa-10c8f9617f0d
How does atmospheric scientist Simon Lee describe the relationship between El Niño and the polar vortex?
Lee uses a movie analogy to explain the hierarchy of influences, stating that if El Niño is a "full-length movie," then the polar vortex might be a "scene within the movie," and the day-to-day weather systems are the "characters." He notes that El Niño shapes the seasonal average, while the vortex matters more for week-to-week swings once winter is underway.
Q&A ID d4283bee-1f82-4b51-8b85-cd2978cfcf3e
Why is it difficult for scientists to provide a definitive long-range winter outlook regarding the polar vortex?
Scientists face several challenges: the link between El Niño and the polar vortex is not well understood, and the timing of a polar vortex disruption is difficult to predict more than about 10 to 14 days ahead. Because the risk of colder weather is linked to exactly when a disruption occurs, forecasters often cannot incorporate stratospheric information into long-range seasonal maps with certainty.
Q&A ID 5dc31b98-8723-42de-a336-fb90f6be140f
What are the specific weather implications when the polar vortex weakens or gets knocked off center?
When the polar vortex stays strong, intense cold tends to remain bottled over the Arctic. When it weakens, stretches, or is knocked off center, frigid Arctic air can spill south into the central and eastern United States, leading to sharp cold outbreaks and disruptive winter storms in the heart of the season.
Q&A ID 21eede38-da27-45ac-9a62-dd3217ea8c37
What is the current status of the El Niño event and how is it influencing the U.S. winter forecast?
Jon Gottschalck of NOAA’s Climate Prediction Center states that this El Niño is already among the strongest on record and is still strengthening. It is currently dominating the seasonal conversation, steering the forecast toward a milder winter for much of North America and a stormier, wetter setup for the West Coast.
Q&A ID db2f64e4-85d3-41c9-bec6-2e15d233c365
How did the polar vortex behave during the start of the 2026 season according to MIT climatologist Judah Cohen?
The polar vortex began with a "record strong" start in 2026, forming around the end of August as sunlight over the North Pole faded. However, by early October, the system had slipped and was undergoing a "polar vortex stretch," making it sit weaker than normal.
Q&A ID f41b7aee-7fea-4c07-b31c-ffa3658f1da9
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AMERICANALMANAC (Sadie Smith) - A potentially historic El Niño could collide with the polar vortex this winter — and scientists admit they don't fully understand what happens next

NOAA forecasts a "very strong" El Niño developing in the equatorial Pacific, possibly among the strongest in the modern record, yet the scientists tracking it concede the climate pattern's interaction with the polar vortex remains an open question with no reliable answer. The federal agency's characterization lands at a moment when Americans from the mid-Atlantic […] The post A potentially historic El Niño could collide with the polar vortex this winter — and scientists admit they don't fully understand what happens next appeared first on American Almanac .

NOAA forecasts a "very strong" El Niño developing in the equatorial Pacific, possibly among the strongest in the modern record, yet the scientists tracking it concede the climate pattern's interaction with the polar vortex remains an open question with no reliable answer. The federal agency's characterization lands at a moment when Americans from the mid-Atlantic to the Pacific Northwest are trying to plan for a winter season that could swing between unusual mildness and punishing cold, depending on atmospheric forces that even top researchers describe in terms of probability, not certainty. Four scientists from NOAA, MIT, Johns Hopkins, and the University of Miami each offered USA TODAY variations on the same theme: we know a strong El…Open

Keywordsel-ninopolar-vortexweathernoaaclimate-changemeteorologywinter-forecastpacific-oceanstratospheric-warmingjet-streamarctic-airclimate-scienceenergy-costsextreme-weatheruncertaintyatmospheric-physicsenvironmental-scienceus-weatherglobal-warmingtemperature-fluctuations