A potentially catastrophic El Niño climate phenomenon is unfolding in the Pacific Ocean, with forecasts suggesting it could become the strongest on record. Climate scientists are watching with growing concern as the system intensifies, threatening to combine with global warming and push temperatures to unprecedented heights in 2027. The consequences of this event will be felt far beyond Australia's shores, with severe impacts expected across the globe, including in the UK.
The El Niño phenomenon is characterised by a warming of sea surface temperatures in the central and eastern tropical Pacific Ocean, leading to significant atmospheric disruption that can result in more extreme weather patterns. While 2026 could potentially see record-breaking temperatures, climate models suggest that 2027 is a more likely candidate for this unprecedented milestone.
A key indicator of an El Niño's strength is sea surface temperature in the Niño 3.4 region of the equatorial Pacific. Dr Zhi-Weng Chua from Australia's Bureau of Meteorology notes that current climate models are forecasting peak temperatures between +2.2C and potentially exceeding +3C, significantly higher than any previous El Niño event. The substantial heat accumulated in oceans over recent decades, a consequence of climate change, is being cited as the reason for this alarming trend.
The Bureau's own model projects an El Niño peaking at approximately +3.3C, with the phenomenon expected to persist well into Australia's coming summer. Climate scientist Dr Zeke Hausfather from Berkeley Earth has reviewed 14 seasonal models and agrees that this year's El Niño is not only likely to be the strongest on record but could potentially exceed all previous events by a significant margin.
While the Bureau stresses that an El Niño's intensity does not always directly correlate with its impacts in Australia, the system typically brings hotter and drier conditions to southern and eastern parts of the country during winter and spring. The UK can expect severe weather conditions to be exacerbated by this event, potentially leading to droughts, heatwaves, and increased risk of extreme weather events.