While many questions surround an El Ni\u00f1o of this magnitude, forecasters are also watching and predicting how the polar vortex could interact with this weather pattern.<\/p>\n
The polar vortex, a region of fast-moving winds encircling Earth<\/a>\u2019s poles, always exists, and it’s often the source of extreme-cold outbreaks that impact the U.S.<\/a> in the winter.<\/p>\n COULD HISTORY REPEAT ITSELF? HOW PAST SUPER EL NI\u00d1O WINTERS OFFER CLUES ABOUT WHAT’S AHEAD<\/a><\/p>\n These outbreaks occur when the normally stable vortex is disrupted by a rapid temperature increase in the stratosphere, tens of thousands of feet above the surface, called a “Sudden Stratospheric Warming” event.<\/p>\n Sudden Stratospheric Warming events can stretch or displace the polar vortex away from the pole, dragging the core of dense Arctic air southward with it, sending it into the Northern Tier of the U.S.<\/p>\n CHICAGO, ILLINOIS – JANUARY 24:A wide-angle view shows the downtown Chicago skyline reflected in the partially frozen surface of Lake Michigan on January 24, 2026. \u00a0<\/p>\n (Jacek Boczarski\/Anadolu\u00a0 \/ Getty Images)<\/p>\n Typically, the polar vortex is very stable and strong during the fall<\/a>, allowing cold air to bottle up and cause more disruptions in the winter months.<\/p>\n This year, however, forecast<\/a> models are saying this may not be the case, as Super El Ni\u00f1o continues to strengthen through the fall<\/a> and winter.<\/p>\n HISTORIC POLAR VORTEX DISRUPTION COULD ARRIVE EARLIER THAN EVER. HERE’S WHAT IT MEANS FOR WINTER<\/a><\/p>\n Forecasts are predicting that the polar vortex will weaken to record lows through early November. What happens after that depends on whether the disruption influences the atmosphere<\/a> below, the FOX Forecast Center<\/a> said.<\/p>\n Circulation changes could extend downward over subsequent weeks, increasing the likelihood of the cold air shifting south into North America, including the U.S.<\/p>\n Super El Ni\u00f1o could offset some of the cooling that the polar vortex pushes into the U.S., the FOX Forecast Center said.<\/p>\n WINTER’S WARNING? MAJOR STORM TARGETS MILLIONS AMID INTENSIFYING SUPER EL NI\u00d1O<\/a><\/p>\n El Ni\u00f1o is known for changing the large-scale circulation across the Pacific, often favoring a stronger southern jet stream<\/a> and a milder winter pattern across Canada<\/a> and the northern U.S.<\/p>\n If persistent high pressure<\/a> over Canada and mild air from the Pacific driven by El Ni\u00f1o dominate, they could limit how often and how long any arctic air from the Sudden Stratospheric Warming events, even some strong ones, gets into the U.S.<\/p>\n The Arctic Oscillation (AO) measures the broad pressure contrast between the Arctic and the middle latitudes, making it one way to track a deepening surface response, the FOX Forecast Center said.<\/p>\n WHAT ARE KING TIDES? THE NATURAL PHENOMENON BEHIND SEASONAL COASTAL FLOODING<\/a><\/p>\n If the AO is negative, it typically means higher pressure over the Arctic and a circulation more favorable for cold air to reach lower latitudes.<\/p>\n If the AO is positive, it could mean stronger circumpolar flow and greater confinement of cold air toward the Arctic, the FOX Forecast Center said.<\/p>\n HOBOKEN, NJ – FEBRUARY 23: A snowman stands in a park in front of the skyline of midtown Manhattan and the Empire State Building in New York City following a snowstorm on February 23, 2026, in Hoboken, New Jersey.\u00a0<\/p>\n ((Photo by Gary Hershorn\/Getty Images) \/ Getty Images)<\/p>\n The FOX Forecast Center said long-range AO guidance shows the AO will stay positive through the first week of November, indicating mild air will stay in place across the U.S.<\/p>\n Starting the second week of November and continuing through the end of the month, models begin to differ.<\/p>\n HOW TO WATCH FOX WEATHER<\/a><\/p>\n Some models show the AO going negative, while others show it remaining positive.<\/p>\n The forecast remains very uncertain, as ongoing Super El Ni\u00f1o conditions complicate predictions, the FOX Forecast Center said.<\/p>\n In the meantime, the Climate Prediction Center calls for above-average temperatures through the third week of November.<\/p>\n![\"CHICAGO,](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/10\/gettyimages-2257494735-scaled.jpg\")
<\/p>\nSudden Stratospheric Warming Events in Super El Ni\u00f1o past
(FOX Weather)
\u00a0<\/p>\nTypical El Ni\u00f1o pattern
(FOX Weather)
\u00a0<\/p>\nArctic Oscillation explainer
(FOX Weather)
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<\/p>\nAO trends
(FOX Weather)
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