The National Weather Service issued high surf advisories for large portions Northern California Thursday morning, with waves up to 30 feet high expected to hit portions of the coast until Sunday.
In San Francisco , the NWS issued a high surf advisory for the Bay Area, expected to last from 10 a.m. local time Thursday until Sunday afternoon. Forecasters predicted 20 to 30-foot waves and cautioned swimmers and boaters to stay out of the water and avoid potentially dangerous conditions.
Further north, the NWS office in Eureka, California issued a high surf advisory that was expected to last until 11 p.m. on Thursday in coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt and Mendocino Coast counties.
“Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties,” the NWS said . “These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water.”