HERMOSA BEACH (CBSLA.com) A high surf advisory was in effect Tuesday for many Southland beaches, the National Weather Service said.

The advisory, which was issued through Wednesday morning, affects west and northwest facing beaches with surf ranging from 4 to 9 feet.

The surf will likely produce strong rip currents and sneaker waves which are capable of washing people into the sea from rocks, jetties and beaches, the NWS said.

The highest surf is expected at shores from Manhattan Beach to Cabrillo Beach.

The conditions are constantly changing and we want people to be aware, Cpt. Chris Linkletter said.

Another westerly swell is expected later this week, likely resulting in high surf Friday into Saturday at beaches from San Luis Obispo County to Los Angeles County.

More than 20 people were rescued by LA County lifeguards Monday due to the high surf at Hermosa, Santa Monica and Zuma beaches.

The county has staffed extra lifeguards and is patrolling beaches around the clock through the advisory.

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High Surf Advisory Issued Through Wednesday