US National Weather Service Eureka California – Beach conditions will be hazardous through the weekend. A large northwesterly swell will bring the threat of sneaker waves on Friday and rapidly building breakers early Saturday morning. Be careful on Friday since there will be long periods of small wave activity that will make the ocean look deceivingly calm. Larger waves could occur at intervals that take as long as 20 minutes to arrive at the coast! By early Saturday morning rapidly building surf will crash over rocks, jetties, and outcroppings. If visiting the beach stay much farther away from the water than typical.