High surf swept away two fishermen Sunday at Rodeo Beach in Marin County, killing one of them, officials said.
The men were fishing from rocks when they were swept out into the surf zone at 12:22 p.m., according to National Park Service and U.S. Coast Guard officials.
"This time of year is notorious for large swells and unpredictable sneaker waves," said Capt. Greg Stump, commander of Coast Guard Sector San Francisco.
Crews on boats and jet skis were sent after the men, one of whom was rescued from a rock that he was able to swim to.
The second man was unconscious when he was pulled from the water, according to the Coast Guard. A crew member tried to resuscitate the man as they transported him to the dock, where he was pronounced dead.
A strong northern Pacific storm system has been whipping up strong surf along California's coastline, creating hazardous conditions for beach-goers.
The National Weather Service issued a high surf advisory for west-facing beaches along the Central California coast down through Ventura County for Monday, with large swells producing waves up to 12 feet high.