NASA satellites are following changes in the Pacific Ocean during the 2026 El Niño. This natural event brings warmer water to parts of the ocean near the equator. It usually returns every two to seven years. The changes can affect winds and rainfall far beyond the ocean itself. Scientists use several kinds of observations to follow its development.
In an October 15 report, NASA explained why sea height is useful. Water expands as it warms, so warmer areas can have a higher surface. The Sentinel-6 mission measures ocean height roughly every ten days. Other instruments watch temperature and ocean colour. Together, these views help researchers build a clearer picture. They do not mean every place will experience the same weather.