San Luis Obispo County under coastal flood, high surf advisories

San Luis Obispo County residents woke Sunday to a pair of weather advisories as Tropical Storm Rachel approached the Central Coast. The National Weather Service placed the county under both high surf and coastal flood advisories from Sunday morning through Monday at 10 p.m., warning that minor to moderate flooding of seawater is likely around high tides at beaches and harbor areas — flooding that is uncommon with normal tidal ranges.

CalCoastNews first reported that the storm also carries the potential for rain, strong winds and cooler temperatures across the region Sunday evening into Monday morning.

What the advisories mean

The coastal flood and high surf advisories are in effect from Sunday morning through Monday at 10 p.m., according to the National Weather Service. High tides are expected to peak around 7.5 feet Sunday morning and around 7 feet Monday morning.

"Minor to moderate flooding of sea water is likely around high tide at beach and harbor areas that is uncommon with normal tidal ranges," the National Weather Service said in its advisory. "Low lying areas will be most susceptible, including Oceano."

For residents and visitors along the coast, that translates to a real risk of water reaching places it normally doesn't — parking lots near the shore, beach access points, harbor walkways and low-lying neighborhoods within easy reach of the surf line. Coastal flood advisories of this kind typically call for caution rather than evacuation, but they do urge residents in vulnerable areas to move vehicles away from the waterline and avoid walking near breaking waves, where sneaker waves and rip currents can catch beachgoers off guard.

Oceano and the low-lying coast most at risk

The weather service's specific callout of Oceano will come as no surprise to locals. The community along the Oceano Dunes and Pismo State Beach area sits at some of the lowest elevations on the San Luis Obispo County coast, and it has repeatedly borne the brunt of coastal flooding and erosion events during past winter storm seasons. Areas near the entrance to the dunes, as well as stretches of the beach itself, are especially exposed when elevated tides combine with storm-driven surf.

Harbor areas — including Morro Bay and Port San Luis — are also named in the advisory's warning zone, where high water around peak tides can inundate docks, launch ramps and shoreline parking.

Beachgoers, surfers and anglers should treat the next two days with caution. High surf advisories bring an elevated danger of large shore break, strong rip currents and occasional sneaker waves that can sweep people off jetties, rocks and wet sand. The standard guidance from forecasters in these conditions: never turn your back on the ocean, stay off exposed rocks and jetties, and keep a safe distance from the water's edge.

What Tropical Storm Rachel brings next

Beyond the coastal flooding threat, the storm system has the potential to deliver rain, strong winds and cooler temperatures to the Central Coast Sunday evening and Monday morning, according to the National Weather Service. That combination — elevated tides, large surf and gusty onshore winds — is what forecasters watch closely, because wind-driven wave run-up can push seawater farther inland than tides alone would suggest.

Residents in flood-prone coastal zones are encouraged to monitor updated forecasts through the National Weather Service, as advisories can be upgraded to warnings if conditions worsen. Drivers should also be prepared for ponding on coastal roadways near high tide, particularly around the Monday morning peak of roughly 7 feet.

How to prepare and stay informed

With the advisories running through Monday at 10 p.m., there are a few practical steps locals can take now: move vehicles and valuables out of low-lying coastal areas before Sunday evening, secure loose outdoor items that strong winds could turn into projectiles, and avoid unnecessary trips to the beach while the surf advisory is in effect.

Anyone planning to be near the coast should check the latest updates from the National Weather Service's San Luis Obispo County forecast, and follow local emergency information from county officials. Conditions associated with tropical systems can shift quickly, and the forecast for rain and wind timing may be refined as the storm moves through.

For San Luis Obispo County, the episode is a reminder that October storms — not just winter atmospheric rivers — can pack a coastal punch. As Tropical Storm Rachel works its way past the Central Coast, the focus for the next 36 hours is on the tides: a roughly 7.5-foot peak Sunday morning, another around 7 feet Monday morning, and seawater with nowhere to go but into the lowest-lying corners of the coast, Oceano chief among them.

This article is based on reporting by [CalCoastNews](https://calcoastnews.com/2026/10/san-luis-obispo-county-under-coastal-flood-high-surf-advisories/) and information from the National Weather Service.