Southern California’s coastline is facing several days of exceptionally high tides that could challenge long-standing records, with coastal flooding, beach erosion, road closures, and damage to vulnerable infrastructure possible through Thursday, October 29.
The National Weather Service has warned that high tides are expected to reach approximately 7.5 to 8 feet during late-morning hours, with the highest tides occurring Monday through Wednesday. In San Pedro, the current record high tide is 7.93 feet, set on January 10, 2005. Forecasters say the upcoming tides could approach or exceed that level.
The threat comes after weeks of unusually high surf and coastal flooding have already damaged parts of Southern California. Long Beach, Newport Beach, Malibu, Dana Point, and other communities have dealt with eroded beaches, flooded streets, damaged homes, and weakened coastal infrastructure.
The situation is especially serious in areas that have already lost substantial amounts of beach sand. Officials are now moving sand, reinforcing berms, installing sandbags, preparing pumps, and monitoring vulnerable infrastructure before each high tide.
For residents and visitors, the next several days will require extra attention to tide schedules, road conditions, beach closures, and transportation changes.
Why These Tides Could Approach Or Break Records
The upcoming event is being driven by several factors occurring at the same time.
The position of the Earth, moon, and sun creates predictable astronomical tides, but those tides are being amplified by unusually warm ocean water and longer-term coastal conditions. The National Weather Service reported that observed water levels have recently been 1.5 to 1.7 feet above astronomical tide predictions along the San Diego and Orange County coast.
Warmer seawater also contributes to higher sea levels because water expands as its temperature increases. The Southern California coast has experienced exceptionally warm ocean conditions this year, adding another factor to an already unusual tidal cycle.
The current high-tide period also coincides with portions of an 18.6-year lunar nodal cycle, which affects tidal patterns. Researchers at Scripps Institution of Oceanography have been monitoring the interaction between the astronomical cycle, unusually warm water, and coastal water levels.
That combination helps explain why the upcoming tides could be substantially higher than the standard astronomical predictions.
The distinction matters because tide tables alone may underestimate the water levels residents actually see along the shoreline. Local water levels can also be affected by waves, wind, atmospheric pressure, ocean temperature, and coastal geography.
The National Weather Service is therefore urging people in vulnerable areas to monitor current conditions rather than relying exclusively on historical tide charts.
Newport Beach Declares A Local Emergency
Newport Beach is among the communities preparing most aggressively for the approaching tides.
The Newport Beach City Council declared a local emergency ahead of the October 26–28 king tides and activated the city’s Emergency Operations Center. Officials are coordinating across city departments and preparing resources for potential flooding in low-lying neighborhoods and waterfront areas.
City officials estimate that recent ocean water levels have been approximately 18 to 22 inches above predicted astronomical tides. If similar conditions continue during the current king-tide period, flooding could affect portions of the Balboa Peninsula, Balboa Island, Newport Island, West Newport, and other low-lying areas.
Newport Beach has also been reinforcing protective sand berms, inspecting stormwater infrastructure, preparing tide valves and pumping systems, and positioning sandbags and equipment in flood-prone areas.
The city has approved a project to place approximately 100,000 cubic yards of sand along eroded portions of the West Newport shoreline between 36th and 62nd streets. The sand is being transported from the mouth of the Santa Ana River and is intended to restore portions of the beach while providing additional protection against erosion and flooding.
These measures are especially important because parts of Newport Beach were already inundated earlier this month.
Visitors should also pay attention to temporary restrictions around beach protection infrastructure. The city previously warned residents and visitors to stay off protective sand berms because walking or climbing on them can weaken the structures and reduce their ability to protect nearby properties.
Long Beach Is Preparing For Another Round Of Coastal Flooding
Long Beach is facing similar concerns along the Long Beach Peninsula, where recent high surf has already caused substantial erosion and property damage.
The peninsula has experienced repeated impacts from unusually high water levels and powerful waves, leaving some beachfront properties particularly exposed. Local officials have been working to restore sand and reinforce the shoreline before the next round of elevated tides.
ABC7 reported that several homes along the Long Beach Peninsula had been red-tagged in recent weeks because of flooding and damage associated with high surf and high tides. The city has also been moving sand to the shoreline as part of its efforts to rebuild the beach profile.
The situation demonstrates why the current event is different from an ordinary king tide. High astronomical tides alone can produce nuisance flooding, but when they arrive after weeks of erosion and elevated surf, communities have less natural protection between the ocean and developed areas.
The National Weather Service expects minor coastal flooding in portions of Los Angeles County, including shallow flooding around harbor walkways, beach parking lots, and bike paths. Moderate to significant beach erosion is also possible.
People visiting the Long Beach waterfront should therefore avoid assuming that familiar walking paths or parking areas will remain accessible during the highest morning tides.
Orange And San Diego Counties Face The Greatest Flooding Threat
The National Weather Service has issued a Coastal Flood Warning for coastal Orange and San Diego counties through 1 p.m. Thursday, October 29.
The warning states that significant coastal flooding is expected during late-morning high tides. Numerous roads could close, while low-lying homes, businesses, and some critical infrastructure may experience inundation. Shoreline erosion is also expected.
San Diego County communities face the same combination of high water and vulnerable coastal infrastructure. Beaches, coastal roads, parking areas, and pedestrian routes can flood when water levels rise above their normal range.
Orange County is particularly important for travelers because several popular beach communities sit close to the shoreline and are connected by roads and rail lines that run alongside the coast.
The warning does not mean every beach or neighborhood will flood. Conditions can differ significantly from one location to another depending on elevation, seawalls, beach width, harbor configuration, and the timing of the high tide.
Travelers should therefore check local advisories for their specific destination rather than assuming conditions in one coastal city apply everywhere.
Metrolink Suspends Service Near The South Orange County Coast
The high tides are already affecting regional transportation.
Metrolink announced that Orange County Line trains will not operate between Laguna Niguel/Mission Viejo and Oceanside from Monday, October 26, through Friday, October 30 because of forecast high tides along the South Orange County coastline. Trains will instead originate and terminate at Laguna Niguel/Mission Viejo.
There will be no alternate bus transportation provided for the suspended section.
Metrolink said the decision is intended to reduce the possibility of widespread delays and cancellations if water affects the coastal rail corridor. Crews will conduct frequent inspections and stage personnel and equipment near the affected area.
The rail line is particularly vulnerable because sections of the route run close to the shoreline near San Clemente and other South Orange County communities.
Amtrak Pacific Surfliner service is expected to continue as long as conditions remain safe, but travelers should check current service information before heading to the station.
For visitors planning a coastal trip between Orange County and San Diego, the Metrolink suspension means that normal rail travel plans may need to be adjusted.
Pacific Coast Highway And Other Roads Face Additional Pressure
Coastal roads are also vulnerable as water levels rise.
The Los Angeles Times reported that Highway 1 near Point Mugu in Ventura County has already experienced damage after seawater reached the roadway and weakened portions of the route. Crews have been installing large rocks to provide additional separation between the road and incoming waves.
A separate vulnerability exists near Crystal Cove, where Caltrans has been responding to a crack beneath Coast Highway between Newport Beach and Laguna Beach. Temporary barriers are being installed to help absorb wave energy while additional stabilization work is planned.
These locations illustrate why the current high tides could create problems even without a major storm system. Roads that have already suffered erosion have less tolerance for additional seawater.
Drivers should never attempt to cross a flooded roadway simply because another vehicle has already passed through. Water depth can be difficult to judge, and coastal flooding can conceal debris, damaged pavement, or strong currents.
The National Weather Service specifically advises motorists not to drive around barricades or through water of unknown depth.
Beachgoers Face More Than Just Rising Water
The high tides also create additional risks for people visiting Southern California beaches.
The National Weather Service has identified a moderate rip-current risk during the advisory period. Elevated water levels can also change the shape of beaches and expose or destabilize areas that are normally safe to access.
Visitors should be particularly careful around:
- Harbor entrances and narrow channels
- Rock jetties and breakwaters
- Low-lying beach parking areas
- Coastal bike paths
- Exposed seawalls and rocks
- Recently eroded sections of beach
A calm-looking ocean can still produce dangerous currents and unexpected waves. People should follow lifeguard instructions and posted closures rather than relying on conditions observed from a distance.
The risk is also relevant to surfers and boaters. Changing water levels can alter access points and currents around harbor entrances, while eroded beaches can expose debris or infrastructure that is normally buried.
California’s coastal parks and beaches remain popular destinations during fall, but visitors should check current local conditions before making a trip. The California destinations guide can help with broader trip planning, while official city, county, park, and weather advisories should determine whether a specific coastal activity is appropriate.
How Residents Can Prepare Before The Highest Tides
People living or staying in low-lying coastal neighborhoods should prepare before the morning high tides rather than waiting for water to reach their property.
The National Weather Service recommends taking action to protect flood-prone property. Newport Beach is already distributing and positioning sandbags, preparing pumps, and reinforcing coastal defenses.
Useful steps include:
- Move vehicles to higher ground. Avoid leaving cars overnight or during high-tide periods in low-lying coastal parking areas.
- Protect vulnerable entrances. Use approved flood barriers or sandbags where appropriate.
- Secure outdoor items. Furniture, equipment, decorations, and loose materials can become hazards when water reaches properties.
- Monitor local alerts. Conditions can change quickly, particularly if high tides coincide with waves or rainfall.
- Plan alternative routes. Coastal roads and parking areas may become inaccessible during late-morning high tides.
- Follow barricades and closures. Never enter an area that officials have closed because of flooding or erosion.
Newport Beach’s preparedness information also warns that unusually high tides, elevated surf, and winter storms can combine to increase flooding, beach erosion, and infrastructure damage.
The timing is especially important because the highest tides are expected during the late morning, with the strongest potential Monday through Wednesday.
Why The Risk Could Continue Beyond Thursday
Thursday’s end to the current coastal flood warning does not mean Southern California’s high-tide concerns are over for the season.
Newport Beach officials have identified additional unusually high tide periods during November, December, and into early 2027. The city expects the interaction between high astronomical tides, warm ocean temperatures, El Niño conditions, and future storms to remain an important coastal-management issue.
The Los Angeles Times reported that tide levels are expected to become particularly high again around Thanksgiving, Christmas, and Martin Luther King Jr. Day, potentially creating additional challenges if those tides coincide with winter storms.
That combination is more concerning than any individual tide event. A high tide may cause relatively limited flooding under calm conditions, while the same water level combined with large waves or a winter storm can produce much greater erosion and property damage.
California’s coastline is therefore entering a period when residents, transportation agencies, and coastal communities will need to monitor several interacting hazards rather than relying on one forecast.
Southern California’s Coast Is Entering A More Vulnerable Period
The next several days will test coastal defenses across Southern California.
High tides between 7.5 and 8 feet, observed water levels already running 1.5 to 1.7 feet above astronomical predictions, and a current record of 7.93 feet in San Pedro have put communities from Los Angeles to San Diego on alert.
Newport Beach has activated its Emergency Operations Center and is reinforcing its coastline. Long Beach is working to restore eroded beaches. Metrolink has suspended service along a section of the Orange County Line. Transportation and emergency crews are preparing for possible flooding and infrastructure disruptions.
For residents and visitors, the safest approach is straightforward: check local conditions before traveling, avoid flooded roads and exposed shoreline areas, respect closures, and take precautions before the late-morning high tides.
The current event may pass without every location experiencing severe flooding, but the combination of record-level water, existing erosion, and vulnerable coastal infrastructure means the warnings deserve attention.
Southern California’s coast has already absorbed weeks of unusually harsh conditions. The coming high tides could add another chapter to an increasingly difficult fall for communities living and traveling along the Pacific shoreline.