The National Weather Service issued a high surf advisory that went into effect Monday, at 5 a.m. and will continue to noon on Wednesday. Waves have been building on Sunday with waves reaching 4 to 6 feet.

Sgt. Rich Stropky with San Diego Lifeguards says waves will keep increasing in size to 5 to 7 feet with sets up to 9 feet on Monday, and then higher still to 6 to 8-foot waves with occasional sets up to 10 feet on Tuesday.

Stropky said the much larger than normal surf can sneak up on surfers suddenly, and he says that the bigger waves make the already strong rip currents even more dangerous. Lifeguards say they'll increase their staffing as needed to keep an eye on those venturing into the water over the next few days.