NASA satellites observe historic 2026 El Niño

NASA satellites have detected what appears to be the strongest El Niño event since records began in 1950, according to recent observations. The phenomenon, characterized by unusually warm ocean temperatures in the equatorial Pacific, is altering weather patterns globally and affecting marine ecosystems. As of October 2026, the National Oceanic and Atmospheric Atmospheric Administration (NOAA) estimates an 83% probability that this El Niño will reach unprecedented intensity. The event began with the detection of a Kelvin wave in January 2026 near Micronesia in the western Pacific. These slow-moving pulses of water, thousands of miles long, transport heat from west to east across the Pacific. The warm water heats the air above it, leading to rising air and changes in atmospheric pressure. This process weakens or reverses the typical trade winds blowing from the Americas toward Asia, resulting in higher sea levels in the eastern Pacific and further warming of the waters. By early April 2026, these Kelvin waves had reached the eastern Pacific, and sea surface temperatures had started to increase. Scientists observed that sea levels in certain regions rose by as much as 1 to 1.3 feet (30 to 40 centimeters), while areas around Indonesia and northern Australia saw sea levels drop by 6 to 8 inches (15 to 20 centimeters). Josh Willis, a project scientist for sea level missions at NASA’s Jet Propulsion Laboratory, described Kelvin waves as “the heartbeat of El Niño.” He noted that satellite altimetry allows researchers to monitor ocean heights with high precision, providing valuable insights into how El Niño develops and evolves over time. Sea surface temperatures in the eastern Pacific have risen approximately 1.7 degrees Celsius above the long-term average and could increase slightly more in the coming months. Microwave and infrared radiometers aboard satellites enable scientists to measure heat energy at the sea surface, even through cloud cover. These instruments have tracked the expansion of warmer-than-average water across the Pacific during the spring of 2026. In addition to temperature changes, the El Niño event has affected the color of the ocean. Satellite images show a decrease in phytoplankton, microscopic organisms responsible for the greenish hue of the ocean. The reduction in phytoplankton is linked to the warming of surface waters, which disrupts the usual upwelling of cold, nutrient-rich water from deeper layers. This disruption limits the availability of nutrients for phytoplankton, reducing their population and changing the ocean's appearance. The PACE satellite, launched in February 2024, has been instrumental in observing these changes. It measures light reflected from the ocean across hundreds of wavelengths, allowing scientists to detect subtle shifts in color that might not be visible to the naked eye. Images collected in October 2026 show the spread of warmth along the coast of Chile and into the southeastern Pacific, contributing to the transformation of the ocean’s color. The impact of this intense El Niño extends beyond oceanic changes. Scientists warn that the phenomenon could lead to extreme weather conditions, including increased rainfall in some regions and droughts in others. Coastal communities are particularly vulnerable to rising sea levels and altered weather patterns. Farmers and firefighters are already adapting to the new conditions, preparing for potential challenges posed by the changing climate. As the El Niño event progresses, continued monitoring by NASA and other scientific institutions will provide crucial information about its effects on global weather systems and marine life. Researchers remain focused on understanding how this powerful climate phenomenon interacts with ongoing climate change, seeking to predict future impacts and develop strategies for mitigation and adaptation.