Sneaker Waves Trigger Hazard Advisory For Peninsula Coast

SAN MATEO COUNTY, CA — The National Weather Service has issued a beach hazard advisory for coastal areas of the Bay Area including in San Mateo County due to an increased risk of sneaker waves.

Northwest-facing beaches are at high risk for sneaker waves, according to the NWS.

The advisory is in effect through 11 p.m. Monday along the coast from Big Sur to Sonoma County.

“Heads up for anyone whose Halloween plans involve a trip to the beach: There's a Beach Hazards Statement for an increased risk of sneaker waves and rip currents, especially for northwest facing beaches, from 5 AM to 11 PM on Monday,” the NWS tweeted Monday.

Sneaker waves are potentially deadly large, unexpected waves that typically surge up the beach further than expected and can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches.

“These waves can also move large objects such as logs, crushing anyone caught underneath,” the NWS said.

The highest risk of sneaker waves and strong rip currents will be on Monday morning through the afternoon, the agency said.

“Don't be fooled by an ocean that looks calm,” the NWS said.

“There can be 30 minutes of small waves before a sneaker wave strikes. Avoid rocks and jetties. Avoid steep beaches. Stay much farther back from the water and never turn your back on the ocean.”