A major storm pounded California’s central coast on Monday, bringing flooding and high surf that was blamed for fatally trapping a man beneath debris on a beach and later partially collapsing a pier, tossing three people into the Pacific Ocean.

The storm was expected to bring hurricane-force winds and waves up to 60 feet (18 metres) as it gained strength from California to the Pacific Northwest.

Some California cities ordered beachfront homes and hotels to evacuate early on Monday afternoon as forecasters warned that storm swells would continue to increase throughout the day.

“We are anticipating that what is coming toward us is more serious than what was there this morning,” said Fred Keeley, mayor of the city of Santa Cruz, where the pier collapsed.

In Watsonville along the Monterey Bay, first responders were called to Sunset State Beach, a state park, around 11.30am on Monday for a report of a man trapped under debris.

David Johnston, owner of wharf based Venture Quest kayaking, stands by his shop on the Santa Cruz wharf (Martha Mendoza/AP)

The Santa Cruz County Sheriff’s Office believes a large wave pinned him there. The man was pronounced dead at a hospital. Other details were not immediately available and his name has not been released.

The storm’s high surf also likely pulled another man into the Pacific Ocean around noon Monday at Marina State Beach, nearly 13 miles (21 kilometres) south of Watsonville, authorities said. Strong currents and high waves forced searchers to abandon their efforts roughly two hours later as conditions worsened. The man remained missing on Monday evening.

In Santa Cruz, the municipal wharf under construction partially collapsed and fell into the ocean around 12.45pm taking three people with it. Two people were rescued by lifeguards and a third swam to safety. No one was seriously injured.

Mr Keeley, the mayor, said that section of the wharf had been damaged over time. The structure was in the middle of a multi-million dollar renovation following destructive storms last winter about 70 miles (112 kilometres) south of San Francisco.

“It’s a catastrophe for those down at the end of the wharf,” said David Johnston, owner of Venture Quest Kayaking, who was allowed onto the pier to check on his business.

Tony Elliot, the head of the Santa Cruz Parks & Recreation Department, estimated that about 150 feet (45 metres) of the end of the wharf fell into the water. It was immediately evacuated and will remain closed indefinitely.

Some of the wharf’s pilings are still in the ocean and remain “serious, serious hazards” to boats, the mayor said. Each piling weighs hundreds of pounds and is being pushed by powerful waves.

“You are risking your life, and those of the people that would need to try and save you by getting in or too close to the water,” the National Weather Service’s Bay Area office said on the social platform X.