https://www.npr.org/2021/12/03/ [login to see] /grab-your-camera-and-help-science-king-tides-are-crashing-onto-california-beache
Over the weekend, the moon, Earth and sun will all come into alignment, causing the California coast to see unusually high tides, known as king tides.
The planetary confluence combined with the gravitational pull of the sun and moon will bring some of the highest and lowest tides of the year and could lead to localized flooding in some coastal communities, particularly the San Francisco Bay Area.
Though the NWS has issued beach hazard advisories in the Southern California region, no significant damage is expected.