Thermal expansion driven by the current El Nino cycle has pushed sea levels up by as much as 1.3 feet across parts of the eastern Pacific. Researchers utilizing altimetry measurements from NASA's Sentinel-6 satellite tracked how warming ocean waters expand and create dramatic increases in coastal water heights. This phenomenon is amplified by Kelvin waves, which are massive swells of warm water that warp trade winds while pushing taller, warmer water toward the Pacific coastlines of North and South America.
Climate researchers warn that these elevated ocean patches combine dangerously with high tides influenced by the Moon's 18.6-year lunar nodal cycle. A new pre-print study forecasts a tenfold increase in extreme sea-level risk along coastlines stretching from Alaska to Chile during the 2026-27 El Nino period. Environmental researchers point out that strong El Nino events cause sea levels to rise more steeply than a standard linear increase, catching communities off guard if they only extrapolate from milder events.
The compounding effects of seasonal thermal expansion, baseline global warming sea-level increases of roughly 7.8 inches, and tidal extremes create a severe flood hazard for coastal populations. To help communities visualize these threats, researchers have developed an interactive mapping tool called El Nino Flood Watch. While the platform offers local projections for Hawaii and Western Hemisphere Pacific coasts, scientists emphasize that immediate preparation remains necessary to mitigate potential severe flooding.
El Nino Thermal Expansion Raises Pacific Sea Levels by Over a Foot
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