A high surf advisory has been issued for the San Luis Obispo County coastline by the National Weather Service.
The agency said surf will range from 10 to 14 feet at west and northwesterly facing shorelines. Waves will start to lower gradually overnight. The advisory is in effect until 4 a.m. Christmas Day.
"Large surf and very strong rip currents will make ocean activities dangerous for anyone," the Weather Service said.
The cause is a long-period swell breaking on westerly facing beaches north of Point Conception.