Overnight, the high swell has been traveling towards NW California coast. At around 11 pm Wednesday, Buoy 46015 saw wave height rise to 19 feet with a wave period of 19 seconds. This indicates a surf height of 27 feet. A High Surf Advisory is in effect for west and northwest facing beaches along NW California coast through 4 pm this afternoon. After that, sneaker wave threat will persist through Friday afternoon.