Federal climate forecasters say the weather pattern building in the tropical Pacific Ocean this year may become the most powerful El Niño ever measured. The event has already picked up nicknames like "Super El Niño" and even "Godzilla El Niño" as ocean temperatures continue to climb.
El Niño is a recurring natural climate phenomenon, appearing roughly every two to seven years. It begins when an enormous stretch of water in the eastern Pacific Ocean, near the equator, grows unusually warm. That warm water then releases vast amounts of heat, moving warmth out of the ocean and into the atmosphere, which in turn reshuffles weather patterns across the globe.
The phenomenon has a counterpart known as La Niña, defined by cooler-than-normal water in the same equatorial region of the Pacific. Together, the two phases drive some of the largest swings in weather variability the planet experiences from year to year.
The effects of an El Niño can touch hundreds of millions of people worldwide. Storms, rainfall, droughts, and temperature extremes shift in ways that reach far beyond the Pacific itself. What makes the pattern especially difficult to plan for is that its consequences are not identical from one event to the next. Where floods strike, where drought settles in, and how severe conditions become can differ drastically between one El Niño and the following one.
To understand how a change in one part of the ocean can influence weather thousands of miles away, scientists turn to a simple comparison. Daniel Vimont, a professor of atmospheric and oceanic sciences at the University of Wisconsin-Madison, describes El Niño as being like a rock dropped into a pond.
"If you throw a rock into a pond, the ripples spread outward. Even though you're not where the rock hit, you still may feel the effects of those waves," Vimont explains. "El Niño is the same thing, except it's an enormous rock in the ocean." In other words, the tropical Pacific is the point of impact, but the ripples travel through the atmosphere and are felt across the world.
Satellite observations tell the story of how this year's event has developed. In June 2026, sea surface temperatures along the equator in the Pacific were already abnormally warm, a clear signal that an El Niño was forming. Since that time, those temperatures have only continued to rise, pushing the event toward record territory.
The last strong El Niño occurred in 2015, and its impacts were severe. South Carolina experienced catastrophic flooding that year, driven by rainfall that broke records. Forecasters now warn that the event currently taking shape is likely to be even stronger than the one that produced those floods, raising the prospect of comparable or worse extremes in the months ahead.
The 2015 event serves as a reminder that El Niño's dangers are not confined to the tropics or to the Pacific coastline. Heavy rain and flooding can appear in places far removed from the warm water that sets the pattern in motion, and the damage can be both widespread and costly.
As the current event strengthens, its timing and severity carry direct consequences for emergency planning, water management, agriculture, and disaster response. Communities that have experienced El Niño-driven floods or droughts before may need to prepare again, while regions that were spared in past events cannot assume they will be lucky this time.
Scientists are also racing to learn as much as possible while this El Niño is active. A separate report notes that studying this super El Niño closely could help save lives, even as NOAA scales back some of its research efforts. The tension between the need for better forecasts and reduced research capacity is a concern for those who study these events.
For all the attention the "super" label attracts, researchers caution that each El Niño writes its own story. The strength of the warm water is only one factor; how the atmosphere responds, and how that response interacts with other climate patterns, determines which regions see floods and which see drought.
What forecasters can say with confidence is that a powerful El Niño is now developing, that it has the potential to surpass the strongest events on record, and that its influence will be felt far from the equatorial Pacific where it was born. For hundreds of millions of people around the world, the ripples from this particular rock are already spreading.
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