The National Weather Service issued high surf advisories Thursday morning for Northern California, with 20-to-30-foot waves expected through Sunday.

A powerful storm pummeling the West Coast churned up waves as high as 60 feet, killing one man, sweeping another out to sea and prompting multiple rescues when a pier collapsed in Santa Cruz, California,

Officials are forecasting weather with moderate risk levels to continue this week for Southern California’s coastal and inland regions. The National Weather Service predicts that large seas and high surf with chances for strong rip currents and minor coastal flooding will continue through Friday for Los Angeles,

Three people were rescued from the wharf. The powerful surf also fatally trapped a man under debris on a beach in Santa Cruz, the authorities said.