On Friday at 6:46 a.m. the National Weather Service released an updated high surf advisory in effect until 11 p.m. The advisory is for Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast as well as San Francisco County.

The NWS adds to prepare for, “Long period very high northwest swell will result in large breaking waves between 25 to 35 feet on north and west facing beaches.”

“Dangerous swimming and surfing conditions and localized beach erosion. Sneaker waves can unexpectedly run significantly farther up the beach than normal, including over rocks and jetties. These waves can suddenly knock people off their feet and quickly pull them into the cold ocean waters, where currents will be stronger than normal. These waves can also carry driftwood logs and other debris,” says the NWS. “Inexperienced swimmers should remain out of the water due to dangerous surf conditions.”

Source: The National Weather Service