A giant swell of warm water moving across the Pacific Ocean has caught the attention of scientists, with new satellite observations suggesting that an El Niño event could make a comeback later in 2026. According to data collected by NASA and its international partners, a vast mass of warm water has reached the eastern Pacific near South America, one of the strongest early indicators that El Niño conditions may soon develop.
The findings come from the Sentinel-6 Michael Freilich satellite, which monitors global sea levels with remarkable precision. Scientists say the rising ocean surface detected by the satellite is a sign that warmer water is accumulating beneath the surface, a key process that often precedes the onset of El Niño.
Researchers observed a series of warm water waves known as Kelvin waves, traveling eastward across the equatorial Pacific. These waves form when wind patterns temporarily shift allowing warm water that normally remains in the western Pacific to move toward South America.
By May 2026 satellite measurements showed sea levels off the coast of Peru rising more than 15 centimeters above the long term average. Since warm water expands, elevated sea levels provide strong evidence that ocean temperatures are increasing beneath the surface.
NASA scientists believe this development resembles the early stages of previous El Niño events, although the current phenomenon began slightly later than the powerful El Niño episodes recorded in 1997 and 2015.
What Is El Niño and Why Does It Matter?
El Niño is a natural climate pattern characterized by unusually warm sea surface temperatures in the central and eastern Pacific Ocean. While it occurs periodically, its effects can be felt across the globe.
The warming of Pacific waters influences atmospheric circulation and shifts weather patterns worldwide. Depending on its strength, El Niño can trigger heavy rainfall, floods, droughts, heatwaves and disruptions to agriculture and water supplies.
Scientists note that the strongest El Nino events can affect regions thousands of kilometers away from the Pacific Ocean.
Potential Global Weather Impacts in 2026
If El Niño strengthens during the coming months, its effects could become noticeable by late 2026 and early 2027. Historically, El Niño events have been associated with:
• Increased rainfall and flooding in parts of South America.
• Drier and hotter conditions in sections of Asia and Australia.
• More intense winter storms in some regions of North America.
• Rising global temperatures and increased likelihood of heat records.
• Agricultural disruptions due to changing rainfall patterns.
Experts caution that every El Niño event is different, making it difficult to predict the exact magnitude and location of impacts.
Why Scientists Are Closely Monitoring the Pacific
The Sentinel 6 Michael Freilich satellite has become a crucial tool for tracking ocean changes. Orbiting Earth every 10 days, the spacecraft measures sea surface height to within fractions of an inch, helping scientists identify subtle changes linked to climate phenomena such as El Niño.
Researchers say several Kelvin waves occurring over a period of months often signal the development of a significant El Niño. The latest observations suggest that warm water continues to accumulate in the eastern Pacific, increasing the likelihood of further strengthening.
Scientists will continue monitoring ocean temperatures, sea levels, and atmospheric conditions throughout the year to determine whether the warming trend evolves into a full fledged El Niño event.
Climate experts emphasize that El Niño is more than an ocean phenomenon. Its impacts can influence food production, water resources transportation, public health and disaster management across continents.
With many regions already facing climate related challenges an emerging El Niño could add further pressure through extreme weather events. Early detection allows governments, farmers, and emergency agencies to prepare for potential changes in rainfall, drought risk and temperature patterns.
As satellite observations continue to reveal the Pacific Ocean changing conditions, scientists say the coming months will be critical in determining whether 2026 becomes the year of El Nino return.