California Hit by Historic High Tides as State Enters 'Extreme Territory'

Record-Breaking Inundations Along the Coast

Historic high tides have caused widespread disruptions across the California coast, submerging streets, homes, and businesses from San Diego to the San Francisco Bay Area. Seawater breached low-lying communities, jamming vital transportation corridors and train routes. In Marin County, north of San Francisco, residents were documented kayaking through typically busy thoroughfares. Emergency responders rescued multiple drivers from floating cars, while cyclists attempting to navigate temporary lagoons found themselves waist-deep in water.

Further south in cities like Newport Beach, water pounded emergency infrastructure, seeping through berms, seawalls, and sandbag blockades along the shoreline. All-time water level records were broken throughout the state. Tides rose above 8 feet near Los Angeles and San Diego, while San Francisco registered its highest October reading on Wednesday, breaking a record set just the day before.

Official Warnings and Meteorological Factors

The National Weather Service issued flood advisories and warnings extending across multiple days. Forecasters in San Diego and Orange counties warned that low-lying properties, roads, and critical infrastructure would face continued inundation during high tides. In Los Angeles, moderate flood risks were projected to extend into the weekend alongside expected shoreline erosion.

According to the National Oceanic and Atmospheric Administration (NOAA), Los Angeles logged 12 coastal flood days in 2026 by late October, outpacing any single year in the last five decades. Climate scientists attribute these conditions to a combination of factors, including thermal expansion from a record-breaking oceanic heatwave, higher baseline sea levels linked to climate change, and a coastally trapped Kelvin wave—a massive underwater band of warm water moving up the North American shoreline.

Future Risks and Upcoming King Tides

Experts warn that conditions may worsen as an exceptionally strong El Niño develops in the Pacific. Climate scientist Daniel Swain noted that the water levels recorded this week could be exceeded multiple times during the winter. NOAA outlooks indicate that San Diego, La Jolla, Los Angeles, and Santa Monica face an 80% or greater chance of high-tide flooding in December.

Significantly, the recent floods were not seasonal "king tides," which are predicted to arrive around the Thanksgiving, Christmas, and mid-January holiday periods. King tides can add an additional foot or two to water levels that are already elevated by roughly a foot due to warming, El Niño, and Kelvin wave effects. Forecasters warn there is a 30% to 40% chance these factors could align, potentially raising sea levels up to 5 feet above average in multiple locations simultaneously and setting the stage for severe flooding if paired with coastal storms.

Practical Implications and Verification

Confirmed Facts

• Record high tides inundated coastal areas from San Diego to the San Francisco Bay Area in late October 2026.
• Los Angeles registered 12 coastal flood days in 2026 as of late October, surpassing any year in the past 50 years according to NOAA records.
• The National Weather Service issued coastal flood advisories and warnings for southern and central California.

What Remains Unknown

• The exact timing, intensity, and landfall locations of potential winter storms interacting with future high tides cannot be predicted with certainty.
• The precise peak water levels depend on how closely future El Niño effects, Kelvin waves, and upcoming king tides align.

How Readers Can Check the Source

Readers can review the original reporting and official meteorological assessments via [The Guardian's coverage](https://www.theguardian.com/us-news/2026/oct/28/california-extreme-weather-high-tides). Localized updates, flood warnings, and tide schedules remain accessible directly through the National Weather Service and NOAA observation stations.