Watch out! Risk of sneaker waves, large breakers on coast in Sonoma, Monterey counties

SAN FRANCISCO (KGO) -- It's going to be sunny and warm on Friday and if you're thinking of heading to the beach, watch out!

A northwest swell is building and will bring a risk of rip currents, sneaker waves and large breakers Friday from Sonoma County to Monterey County.

The National Weather Service says waves may hit 20 feet starting Thursday evening.

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