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Europe and other parts of the world are already experiencing the wrath of El Niño, but a recent revelation by NASA officially declared that El Niño has returned; waters in the central and eastern Pacific have been sitting at least 0.5 degrees Celsius (0.9 degrees Fahrenheit) above average for several months. But even before the official announcement, NASA satellites were already tracking a different kind of warning sign: the ocean's surface is physically rising.

Why a rising Ocean matters
As per the report published in the digital journal SciTechDaily, it was mentioned that it happens due to simple physics—warm water expands. When a massive bubble of warm water spreads across the Pacific, satellites like Sentinel-6 Michael Freilich can detect the subtle lift in sea level. This extra height is a big deal because it reveals where the ocean is storing heat deep below the surface. This hidden reservoir of energy is what decides if El Niño has enough fuel to completely scramble global weather patterns months from now.

When El Niño takes over, it alters rainfall, temperatures, and storm tracks worldwide. It typically brings wetter weather to the U.S. Southwest while raising the risk of severe drought in Indonesia and Australia. The strongest impacts usually hit during the Northern Hemisphere winter, when the ocean's warmth ripples up into the atmosphere and changes the weather thousands of miles away.

Reading the Ocean from Space
A satellite map from June 8, 2026, showed clear red patches spreading across the central and eastern Pacific. On these maps, red means higher-than-average sea levels, blue means lower, and white is near-normal.
To get this picture, scientists at NASA’s Jet Propulsion Laboratory (JPL) stripped away the usual seasonal cycles and long-term sea level trends. This left a clear, undistorted look at El Niño's footprint.
The data came from Sentinel-6 Michael Freilich, a satellite launched in 2020 by NASA and led by the European Space Agency (ESA).


Deep Heat is the real Fuel
This buildup didn't happen overnight. Earlier in the spring of 2026, the satellite caught massive pulses of warm water—called Kelvin waves—sliding eastward across the equator. These waves often trigger when the trade winds weaken or briefly blow backward, letting warm water that was piled up in the western Pacific slosh back toward the Americas.
As that warm water moves east, it deepens the warm upper layer of the ocean and pushes the colder depths down. Essentially, the ocean caps itself with a thick, warm blanket. This is why tracking sea height is so useful. A thin layer of warm surface water can blow away quickly, but a deep reservoir of heat is incredibly hard to disrupt and can feed a much stronger, longer-lasting El Niño.

Are we heading for a 1997-style monster?
The current setup has scientists looking back at the history books. Séverine Fournier, a sea level researcher and deputy project scientist for Sentinel-6 at JPL, noted that conditions in the western Pacific on June 8 looked remarkably similar to June 1997—the start of one of the most intense El Niños ever recorded.
However, 2026 isn't a perfect mirror image of 1997. The eastern Pacific is still lagging behind because fewer Kelvin waves had made the journey by early June.

But that could change fast. More warm waves are currently marching east, suggesting the event is still gathering steam. Whether 2026 matches the historic scale of 1997 depends entirely on how the ocean and atmosphere interact over the next few weeks. For now, scientists say it is shaping up to be a big one, but we still need more satellite observations to know exactly how it will play out.