Something coming: what scientists know about a potential 'super' El Nino

A potentially extreme El Niño event is forming in the Pacific, with forecasters warning its strength could rival historic episodes like those in 1982/83, 1997/98, and 2015/16. The US National Oceanic and Atmospheric Administration (NOAA) estimates an 80% chance of El Niño developing by July, as sea temperatures in key equatorial zones surge toward 2.5°C above average—levels that would classify it as a 'super' El Niño. Adam Scaife, head of long-range prediction at the UK Met Office, called it a "big event," though he cautioned that unpredictable trade winds could still weaken or reverse its development. The phenomenon’s intensity depends on complex interactions between ocean heat and atmospheric conditions, particularly the weakening of east-to-west trade winds—a hallmark of the strongest El Niños. Michelle L’Heureux, NOAA’s El Niño-Southern Oscillation lead, noted these winds are volatile, with sudden strengthening capable of halting or reversing the event’s growth. Without this shift, however, projections suggest temperatures could spike further, potentially triggering widespread weather disruptions. El Niño typically peaks around December, but its heat release can elevate global temperatures for years afterward. Past major events, including those in 1998, 2016, and 2023, coincided with record-breaking heat, with scientists now warning 2027 could see new highs if this year’s El Niño intensifies. While climate change may not directly strengthen El Niño, Scaife explained its impacts—such as droughts in the Amazon, floods in parts of Africa, and extreme heat—will likely be amplified by the already warming atmosphere and oceans. Even a moderate El Niño could exacerbate climate-driven extremes, as the current ocean and atmospheric conditions are far hotter than in past decades. L’Heureux emphasized that stronger El Niños increase the risk of severe weather, though outcomes remain uncertain. The event’s exact trajectory hinges on atmospheric feedback loops that are difficult to predict months in advance, leaving scientists monitoring key wind patterns and ocean temperatures closely. If the 'super' El Niño materializes, its global effects could surpass previous records, with cascading consequences for agriculture, water supplies, and ecosystems. Forecasters stress the need for preparedness, as even a weaker event in today’s climate could produce unprecedented disruptions. The world now faces the dual challenge of managing El Niño’s natural variability alongside long-term climate change impacts.