Water levels at high tide along the San Mateo County coast are expected to be a few inches to a foot higher than usual through the weekend, due to king tides.
"King tides" are especially high tides that happen when the sun and moon's gravitational pulls are aligned. They represent the very highest tides that occur at a given place, according to the California King Tides Project.
King tides this winter will also take place Nov. 26, Dec. 22, 23 and 24, and Jan. 21 and 22.
While the Sheriff's Office of Emergency Services urges caution, the California King Tides Project is also encouraging coastal locals to photograph the peak tides as an act of citizen-driven data collection. Submitted photos will be used to document and catalog local flood risks.
The project also hosts informational events and guided walks to see the king tides.