Record-breaking tides have pushed the Pacific Ocean into California's coastal towns for six straight days, flooding homes, businesses and highways from San Diego to Humboldt Bay, forcing a local emergency in Huntington Beach and closing sections of Pacific Coast Highway. The flooding, which began on October 26 and continued through the Halloween weekend, arrived without a major rainstorm — the sea itself simply rose higher than it ever had before at several gauges, and forecasters warn the worst of the season may still be ahead.
A Week the Sea Would Not Stay Back
The event began with the full moon on October 25, which always pulls tides higher. But this time, unusually warm Pacific water and a strengthening El Nino added to the astronomical push, lifting observed water levels far above predictions. The National Weather Service reported that observed high tides along the Southern California coast ran roughly 1.3 to 1.6 feet above astronomical predictions, and in its own words, sea levels stood around 17 inches higher than a year earlier because of thermal expansion of the record-warm water.
The numbers fell like dominoes. At San Diego, the tide gauge recorded 2.60 metres (8.52 feet) above mean lower low water on Tuesday, October 27 — the highest measurement in the station's record — beating the previous day's record of 2.57 metres (8.44 feet). In Los Angeles, the San Pedro gauge broke its all-time record three mornings in a row, topping the 7.93-foot mark set in 2005. Newport Beach measured an 8.3-foot high tide on October 26, followed by a record 8.4 feet on October 27. La Jolla recorded a preliminary all-time high of 7.98 feet, Santa Barbara beat its own record four days running, and Humboldt Bay in the far north reached 9.12 feet.
In San Francisco, water reached 2.01 feet above normally dry ground on Tuesday, setting a new October flooding record for the city. The National Weather Service extended coastal flood advisories around San Francisco, San Pablo and Monterey bays through November 1, while warnings for Orange and San Diego counties expired on October 29 and advisories lingered into October 30.
Huntington Beach and Sunset Beach Bear the Brunt
Nowhere was the damage more concentrated than in Huntington Beach, where emergency conditions began on October 26 and continued through October 29. Tides there reached 2.50 metres (8.20 feet), flooding Huntington Harbor and Sunset Beach, two of the city's most exposed waterfront communities. Local television station ABC7 reported 114 damaged properties in the city as residents assessed the aftermath.
Photographs from Sunset Beach showed residents crossing their streets on paddleboards while seawater came up through storm drains. The city declared a local emergency, and in an official notice for October 28 it announced closures on Pacific Coast Highway between Warner Avenue and Anderson Street, and on Saybrook Lane between Edinger Avenue and Humboldt Drive. Sections of the highway — one of California's most famous coastal roads — were closed for a third day running as crews pumped water, built sand berms and handed out sandbags.
Newport Beach, just down the coast, declared its own local emergency ahead of the flooding, activated its Emergency Operations Center and approved a sand replenishment project to build a berm along beaches already eroded by swells from large Pacific hurricanes earlier in the year. Seawater entered the Balboa Fun Zone area on October 26, flooding streets and businesses despite protective sandbags and pumping operations. Farther south, rising water reached streets around Pacific Beach and Mission Bay in San Diego.
Flooding Reaches Far Beyond Southern California
The event was not confined to the south. In Marin County, north of San Francisco, bay water put homes under water in Corte Madera and closed a Highway 101 off-ramp. Residents and business owners in coastal communities from Stinson Beach to Moss Landing bailed water from homes and shops, while firefighters checked flooded neighbourhoods and emergency crews monitored dangerous road conditions.
On the opposite coast, the same astronomical tides combined with persistent onshore winds and elevated seas to flood Florida's Atlantic coast from October 26 to 29. Preliminary water levels reached 2.7 feet above mean higher high water at Lake Worth Pier and 2.48 feet at South Port Everglades, both above the highest values in the National Oceanic and Atmospheric Administration's current station tables. Virginia Key recorded its highest king tide — and its third-highest overall water level — since consistent observations began in 1994.
According to reports covering the California flooding, no injuries had been reported, a fortunate outcome given the scale of the inundation. But the property damage, road closures and disruption to coastal businesses were extensive, and the full damage bill had not yet been counted as cleanup continued into the weekend.
What This Means
A king tide is not a storm. It is an exceptionally high tide that occurs when the gravitational pulls of the moon and sun align — typically around a new or full moon, and especially when the moon is at its closest point to Earth. The water rises predictably, on a timetable anyone can read, and then it falls again. What made this week different was the height of the baseline it started from.
Sea levels along the California coast are running well above where they were a year ago, swollen by warm water that physically expands as it heats. Add a full moon, a seasonal alignment and onshore winds, and a tide that forecasters expected to be high became a tide that broke records at gauge after gauge. That is why streets flooded on sunny days, with no rain falling and no hurricane offshore: the ocean did not need a storm to come ashore.
Scientists and coastal managers treat king tides as a preview. The flooding Californians saw this week — water in streets, closed highways, sandbags at doorways — is the kind of event that, as sea levels continue to rise, could become routine rather than remarkable. The California Coastal Commission runs a King Tides Project precisely so residents can photograph and document these events, building a public record of what higher water looks like in real neighbourhoods.
What Happens Next
The immediate danger has not fully passed. Coastal flood advisories around the Bay Area remained in effect through November 1, and a Halloween weekend storm was forecast to bring rain to parts of the Southwest and Southeast, adding runoff to already-saturated coastal ground. Forecasters also warned of building surf into Sunday and Monday.
Looking further ahead, the calendar offers little comfort. The California Coastal Commission's designated winter king-tide observation periods fall on November 24 to 26 and December 23 to 25, 2026, and January 21 to 22, 2027 — and the National Weather Service has noted that predicted astronomical high tides during those winter events would be higher than the ones associated with the October flooding. State officials have warned that tides around Christmas could run higher still.
For coastal residents, the advice from emergency officials remains practical: never drive through flooded roads, keep sandbags and pumps ready, check tide tables before travelling along exposed coastal routes, and heed local evacuation and road-closure orders. The ocean gave California a week of warnings written in water across its highways and living rooms. The next high tides are already on the calendar — and, according to forecasters, they will be higher.
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