California Braces for Record Coastal Flooding as Super El Niño and King Tides Converge

Key points

• The Climate Prediction Center forecasts a greater than 90% chance of a significant El Niño this year, with a 95% likelihood of a 'super' El Niño developing.
• El Niño is already causing sea levels to rise by 0.5 to 1 foot along the Pacific coast, from South America to California, due to thermal expansion of warmer water.
• Peak 'king tides' are expected around Thanksgiving, Christmas Eve, and January 22, coinciding with the highest lunar tidal cycles in decades.
• Marin County has prepared 32 sandbag distribution sites and 11 portable pumps, while Southern California faces risks in low-lying areas like Mission Beach and Newport Beach.
• Experts warn that higher sea levels will impede drainage from heavy rainfall, increasing the risk of inland flooding and coastal erosion.

Background

California experienced significant coastal flooding in January 2026 due to king tides amplified by winter storms, resulting in $4.3 million in damages in Marin County, including $2.6 million for a levee in Santa Venetia. The state was denied federal disaster assistance for that event. This current forecast follows a pattern seen during the 1982-83 and 1997-98 El Niño events, which also coincided with peak tidal cycles and caused record sea levels and severe coastal damage.

How outlets are covering it

The Los Angeles Times emphasizes the unprecedented potential for record sea levels, citing UC climate scientist Daniel Swain and USGS geologist Jonathan Warrick, who warn that the combination of El Niño-driven sea level rise and peak lunar cycles could produce the highest tides in the current geologic epoch. The Marin Independent Journal focuses on local preparedness efforts, highlighting County Executive Derek Johnson’s statement that while the county cannot control the weather, it can control its readiness. The journal notes the specific logistical challenges of king tides occurring during major holidays when staff are absent. Both sources agree on the severity of the threat but differ in focus: the LA Times highlights the scientific mechanism and historical precedents, while the Marin Independent Journal details the immediate administrative and public safety responses.

Why it matters

The convergence of a super El Niño and peak king tides poses a significant risk of widespread coastal flooding, infrastructure damage, and erosion across California. This could lead to economic losses, displacement of residents in low-lying areas, and strain on emergency services. The event also highlights the compounding effects of climate change, as rising baseline sea levels exacerbate the impact of natural tidal cycles and storm surges.

What to watch

Authorities will monitor sea levels and tidal forecasts closely through the winter, particularly around the peak king tide dates. Public agencies will issue early warnings via systems like AlertMarin, with thresholds for rain, tide height, and wind speed. Residents are advised to prepare by purchasing sandbags and understanding local flood risks. The National Weather Service will continue to update precipitation forecasts for California, which are expected to be above average in January, February, and March.