A high-surf warning has been issued for coastal Bay Area today, National Weather Service Meteorologist Mark Strobin said.
The warning, issued for dangerously large waves exceeding 20 feet in height combined with deadly rip currents, will be in effect until about 4 a.m. Wednesday, Strobin said.
Weather officials warn that surf will be dangerous along the coast on beaches and in exposed coastal structures, according to the weather service. Swimming conditions will be very dangerous.
High tides, minor coastal flooding and beach erosion are also possible, according to the weather service.
The high-surf advisory has been issued for the coasts in San Francisco, Monterey and Santa Cruz counties, and the advisory will be upgraded to a warning about 4 p.m. today because of expected dangerous conditions, Strobin said.
The warnings will be downgraded to high-surf advisories about 4 a.m. Wednesday, Strobin said.