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High Surf Advisory In Effect For San Mateo Coastside Until Thursday Morning

The advisory predicts that the highest waves will take place at sunrise Wednesday morning, and could reach up to 20 feet at area beaches. High tides and onshore winds will create a "dangerous near shore environment."

A high surf advisory has been issued from 7 a.m. PST Wednesday morning to 2 a.m. PST on Thursday along the San Mateo County Coastside area.

Issued by the San Francisco Bay Area/Monterey National Weather Service Forecast Office, the advisory warns that the waves will reach their greatest height Wednesday morning at sunrise, and their second-highest height close to midnight Wednesday night.

The office predicted that the height of the waves will reach between 14-17 feet. Waves up to 20 feet might break at area beaches. High tides and westerly shore winds will create a "dangerous near shore environment," the advisory states.

People who do choose to visit area beaches should "use extra caution" and "expect rip currents" in the surf zone, along with localized beach erosion and a chance of coastal flooding during the sunrise high tide, according to the advisory.

By Thursday morning, the advisory states, the waves will decrease in size below 15 feet, due to southerly winds and decreasing high seas.

In addition to the San Mateo County Coastside, the advisory includes the coastal stretch between Sonoma County and Monterey County.

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