A high-surf advisory is in effect until this afternoon for all of the San Francisco Bay Area and Monterey Bay Area coastlines, according to National Weather Service officials.
The advisory is in effect until 2 p.m. for the coastline from northern Sonoma County to southern Monterey County and the Big Sur coast.
Forecasters are expecting a northwest swell of 15 to 18 feet with 11-second swell periods.
Large waves will be capable of sweeping people into the water, which is cold and turbulent. The high surf will also produce rip currents, weather officials said.
People are urged to avoid coastline beaches, rocks, jetties and piers until the high surf subsides.