NASA Satellite Data Put 2026 El Niño Alongside Historic Events
Satellite measurements show the 2026 El Niño resembles the powerful 1997–98 event, although scientists caution that similar ocean conditions do not guarantee the same weather impacts.
A new comparison of satellite observations shows that the 2026 El Niño is displaying features similar to those recorded during one of the strongest events of the past three decades, according to NASA scientists.
Maps released by NASA’s Earth Observatory on 23 October show unusually high sea levels stretching across the central and eastern tropical Pacific. The pattern in data collected on 12 October 2026 closely resembles conditions captured by satellites on 13 October 1997, when a particularly strong El Niño was developing.
Sea-surface height is one way researchers track heat stored in the ocean. Warmer water expands, raising the sea surface, while shifts in trade winds redistribute warm water across the Pacific. The resulting changes help scientists monitor El Niño, the natural climate pattern that can affect rainfall, temperatures and storms around the world.
The comparison draws on a continuous record of satellite measurements extending over roughly 35 years. NASA’s analysis uses data from the earlier TOPEX/Poseidon mission and the more recent Sentinel-6 Michael Freilich satellite.
The 2026 event developed more suddenly than the 1997–98 El Niño, NASA says. Nevertheless, the elevated water extending towards the South American coast resembles the earlier episode more closely than the somewhat different pattern seen during the strong El Niño of 2015–16.
Similar oceans do not mean identical weather
The comparison matters because El Niño changes the movement of heat between ocean and atmosphere, influencing weather well beyond the Pacific. Strong events can bring greater flooding risks to some regions and drought to others, though the effects vary with local conditions and the event’s development.
NASA cautions that this similarity should not be treated as a precise forecast. Differences in how the atmosphere responds, and in where ocean warming is concentrated, can change which regions experience heavy rainfall or dry weather.
An outlook issued by the United States National Oceanic and Atmospheric Administration on 8 October assigned an 83 per cent probability to strong-to-very-strong El Niño conditions persisting through the first three months of 2027. That is a forecast probability, not a guarantee of future weather in any individual country.
For UK readers, the practical point is that a stronger tropical Pacific event can form part of the wider influences on winter conditions, but it does not establish whether Britain will experience a particular storm, temperature or rainfall pattern.
Researchers will continue to compare new satellite measurements with past events as the season develops. The latest maps improve understanding of the ocean state; their value lies in supporting forecasts, rather than replacing the uncertainty inherent in them.
Musa Ersoy
Musa Ersoy is an editor and writer at DEFUXA Global News, covering developments in the United Kingdom and around the world. He researches news stories using official statements, credible sources and independently verifiable information. His editorial work focuses on factual ac…
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