Convergence of El Niño and King Tides Threatens U.S. Coastal Regions

Recent tidal levels along the Southern California coast reached their highest points in over a century during late October, causing significant flooding in areas such as Redondo Beach. Atmospheric and oceanic experts warn that the situation could intensify as upcoming king tides, predicted for late November and December, overlap with current meteorological patterns.

King tides, which occur due to the specific gravitational alignment of the sun, moon, and Earth, are being compounded by El Niño. In the Pacific, El Niño disrupts trade winds, causing warm water to shift toward the Americas via Kelvin waves. As warm water expands, it further elevates sea levels—adding several inches to the impact of standard high tides. Marc Alessi, a climate scientist with the Union of Concerned Scientists, notes that these oceanic heat waves and tidal phenomena are occurring against the backdrop of long-term sea-level rise caused by climate change.

While Florida does not experience Kelvin waves, it remains vulnerable to flooding due to increased precipitation associated with El Niño. Scientific consensus suggests that human-driven climate change is amplifying both the strength of El Niño and the baseline sea levels. As the current El Niño approaches its peak intensity between November and January, coastal regions are bracing for potentially record-breaking tidal impacts.