In the face of an imminent large swell bringing waves of up to 15 feet, San Diego lifeguards are urgently urging beachgoers to refrain from entering the water. The massive waves are expected to persist until Sunday.

"King tide" is a non-scientific term commonly used to describe exceptionally high tides. Tides are long-period waves that travel across the planet as the ocean is 'pulled' back and forth by the gravitational attraction of the moon and the sun interacting with the Earth in their monthly and yearly orbits, according to the National Ocean Service.

In an effort to enhance beachgoer safety, San Diego Lifeguards will increase staffing and patrols. The primary recommendation is to avoid entering the water, with particular caution advised in areas such as Sunset Cliffs and other cliffs. It is imperative to avoid walking on wet cliff surfaces to prevent unnecessary risks.

Another risk arises with tide overflow, as the elevated swell coincides with high tides in the early morning hours, reaching levels between 5 and 6 feet.

Adverse conditions are anticipated from 8 a.m. on Thursday until 2 a.m. on Monday, with warnings about swimming and surfing dangers, as well as beach erosion and minor tidal overflow during morning high tides in low-lying coastal areas, such as parking lots and boardwalks.

Areas most vulnerable to flooding include Cardiff and Seaside State Beaches, some parts of Del Mar, La Jolla Shores, Mission Beach, and Imperial Beach. There is a possibility of flooding in parking lots, parks, and roads, with potential isolated road closures, according to information provided by the National Weather Service.