NASA Visualizes Potentially Unprecedented Super El Niño Using Satellite Data

NASA has released satellite imagery comparing past El Niño events in 1997 and 2015 with the current phenomenon, indicating that the 2026 El Niño is shaping up to be one of the most powerful ever recorded. The images, derived from altimetry satellite data that measures sea height, show how warming waters are distributed across the equatorial Pacific.

Altimetry satellites track sea level height by measuring the time it takes for a radar pulse to travel from the satellite to the ocean surface and back. Areas with higher-than-normal sea levels appear red, normal conditions are white, and lower areas are blue. NASA's Jet Propulsion Laboratory, which analyzes this data, has a 35-year record from overlapping satellite missions.

Josh Willis, project scientist for sea level missions at NASA's Jet Propulsion Laboratory, explained that satellites allow for a retrospective comparison of El Niño events. "And right now, this one is on track to be even bigger," Willis stated.

The images reveal that as of October, the 1997 and 2026 El Niños exhibit similar characteristics, with a pronounced tilt in sea level—low in the west and high in the east—and warm water extending significantly towards South America. This contrasts with the 2015 event, where the warm water did not extend as far toward the South American coast.

El Niño is a recurring climate pattern that occurs every two to seven years. It is characterized by a warming of the ocean surface in the central and eastern tropical Pacific. This warming is driven by a feedback loop where weakening trade winds allow warm surface water to shift eastward, further weakening the winds and intensifying the warming cycle. While El Niños share this fundamental mechanism, each event has unique characteristics in its location and impact.

According to the World Meteorological Organization (WMO), the current Super El Niño is demonstrating "unprecedented strength." Projections indicate that sea surface temperatures in the tropical Pacific could rise as much as 3.8°C above average between November 2026 and January 2027. For context, an El Niño is officially declared when the sea surface temperature anomaly in this region reaches 0.5°C.

"This is literally off the monitoring charts that we have used for the past four decades," said WMO Secretary-General Celeste Saulo. "El Niño will peak towards the end of 2026 but its impacts will be felt long after that."

Past powerful El Niño events have been associated with significant global weather disruptions, including wildfires in Indonesia and the Amazon, drought in southern Africa, and coastal flooding in regions like Southern California. While the visual data provides a strong indication of the current El Niño's potential magnitude, the full extent of its winter impacts remains subject to varying atmospheric conditions.