Historic polar vortex collapse coming within days threatening parts of US with bitter cold

A ‘polar vortex collapse’ could plunge parts of the US into bitter cold as forecasts point to a potentially record-breaking disruption above the Arctic within days.If the winds reverse as forecast, it would mark the earliest such major breakdown in records dating back to 1959, beating the previous earliest date of November 28.MIT research scientist Judah Cohen told FOX Weather: ‘This will be, I think almost undoubtedly, the largest, earliest disruption of the polar vortex on record.’For Americans, any effects could emerge in late November or early December, with areas east of the Rocky Mountains potentially facing colder, wintry conditions.Joshua Senechal, senior meteorologist with The Weather Channel, said: ‘It's possible that the late November to early December timeframe could be nudged a bit cooler here in the US, primarily in the East.’The polar vortex is a powerful band of winds that circles high above the North Pole, helping keep extremely cold air trapped over the Arctic.During a major disruption, those winds can weaken or even reverse, accompanied by temperatures soaring by as much as 90°F in just a few days high above Earth’s surface.Despite that warming overhead, the changes can eventually bring colder weather farther south by altering the jet stream, the fast-moving ribbon of air that helps steer weather systems. A polar vortex collapse is in the forecast for mid-March, bringing more cold temperatures and winter weather to the USThat can allow Arctic air to spill into parts of North America, Europe and Asia, although the location and severity of any cold outbreak depend on how weather patterns develop.Weather presenter Ryan Hall, who runs the YouTube channel Ryan Hall, Y’all, highlighted a section of the vortex being pushed toward Canada.‘And right now, one big piece of it is getting shoved towards Canada,’ Hall said. ‘If that piece keeps drifting our way, that's when things could get really interesting for a lot of y'all.’Some areas could face a sharp drop in temperatures while others remain relatively mild, depending on where weather systems develop and how the jet stream shifts.A breakdown also does not guarantee a major winter storm. Cold air alone is not enough to produce heavy snow, and the current projections do not establish that airports or travel routes will face disruption in early November.A clearer picture of where freezing temperatures, snow or ice might strike will emerge through shorter-range forecasts and official weather alerts closer to the time.A ‘polar vortex collapse’ could plunge parts of the US into bitter cold as forecasts point to a potentially record-breaking disruption above the Arctic within days However, the direction of any cold outbreak remains uncertain. Hall explained that the disruption could push freezing air into Europe or Asia, leaving Americans largely unaffected.Another possibility, he said, is that it could ‘send the cold right down into the US and change what this whole winter looks like.’Even then, Americans would not necessarily feel an immediate drop in temperatures.‘Now, even if those polar vortex winds actually do start to reverse, you're not necessarily going to feel it in your backyard the next day,’ Hall said. ‘It usually takes a few weeks for that to work its way down to us.’He identified late November and early December as the period to watch for potential effects, adding: ‘And it could be big.’For now, Hall said much of the eastern two-thirds of the country is favored to remain warmer than normal through the middle of November. He also stressed that a wind reversal is still uncertain: ‘So, nobody knows yet if this thing is actually going to flip.’ The cold air from a polar vortex is funneled south by Earth's jet stream, which already swept winter storms across the US in FebruaryIn February 2018, a sudden warming above the Arctic helped bring persistent cold to northern Europe, demonstrating how changes far above the ground can eventually affect millions of people below.In the US, NOAA scientists said a weakened and displaced polar vortex helped create favorable conditions for the severe cold that struck the central US in February 2021. Other weather patterns also contributed, meaning the outbreak could not be blamed on the vortex alone.Major sudden stratospheric warmings occur roughly six times per decade, according to NOAA. What makes the current forecast remarkable is its timing, with a potentially major disruption developing before winter has officially begun.Another powerful influence this winter is El Niño, a warming of tropical Pacific waters that can reshape weather patterns around the world. The National Weather Service expects a strong to very strong event to persist into early 2027.In his October 26 outlook, Cohen said the strong El Niño favors an overall mild winter across North America, particularly in the east. But he stressed that this would not rule out wintry spells lasting several weeks, leaving room for significant cold even during a season that finishes warmer than average.