The Met Office released an updated forecast regarding the polar vortex, highlighting the potential for a severe winter cold snap and possible snowfall due to El Niño. A substantial El Niño event is anticipated by late 2026, with certain predictions suggesting it could become the most intense ever recorded. Current sea-surface temperatures have exceeded those observed during any prior event. El Niño “tends to promote the breakdown of the polar vortex, especially in late winter,” according to a US government NOAA Chemical Sciences Laboratory report.
El Niño represents a natural climate pattern emerging in the tropical Pacific. This occurs when sea-surface temperatures in the central and eastern equatorial regions rise notably above average. These modifications shift atmospheric circulation, which can impact weather globally. While El Niño forms part of numerous elements affecting UK weather, its increasing influence could heighten the likelihood of an unsettled period in the upcoming months.
In the latter part of the season, El Niño correlates with a raised risk of cold snaps, the Met Office noted. As winter progresses, especially after El Niño peaks, the stratospheric Polar Vortex may weaken, increasing the possibility of Sudden Stratospheric Warming (SSW) events. SSW involves temperature increases between 10km and 50km above the Earth’s surface. Such warming can drive cold air downward, altering the jet stream and potentially creating a “blocking pattern,” which might prolong frigid conditions through the year’s end.
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Dr Will Lang, the Met Office’s chief forecaster, indicated a “subtle shift in the odds” for El Niño-induced disruption in the upcoming weeks, rather than a definitive outcome. He stated: “We are going in with a heightened potential for wet weather, heightened potential for potentially stormy conditions, and that leads through to a heightened potential for flooding.” This follows the UK’s recent record-breaking summer, marked by five heatwaves from May to August, which caused drought and ignited wildfires. The UK now faces increased chances of wetter and windier-than-normal conditions in the coming months.
Professor Adam Scaife, Head of Long Range Prediction at the Met Office, described this El Niño as an “unprecedented event.” He explained: “We have been signalling for months that the developing El Niño will be an unprecedented event. The fact that it has already exceeded previous records, with several weeks to go before it peaks later this year, shows the enormity of this El Niño. Scientists are still assessing whether the impacts will be in proportion to its magnitude, but we are already seeing expected effects worldwide.”
