sea level rise

CA King Tides Project

King tides are the year’s highest and lowest tides, occurring when there is alignment of the gravitational pull between the sun, moon and Earth. California’s coast is seeing king tides this week—with more on the way in December and January—and with them a chance to participate in a statewide science project.

Flickr/Anita Ritenour

A Central Coast professor is asking surfers to serve as citizen scientists on February 8 and 9, during the final king tide of this season.

King tides are an annual winter occurrence, when the combination of a full moon and Earth’s closer proximity to the sun cause tides that are both higher and lower than the normal tidal range.