ALAMEDA COUNTY (CBS SF) — The National Weather Service has issued a flash flood warning for Alameda, Sonoma, Napa, Santa Cruz and other counties in Northern California.

The warning for Alameda County was in effect until 2:15 a.m. Sunday. Flooding was imminent along the upper San Lorenzo river near Felton. The Castro Valley Creek in Hayward has reached flood stage and is expected to continue to rise.

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The warning for Napa County was in effect until 1 a.m. Sunday. Residents in Yountville and Napa were warned that flooding is expected along Redwood Creek.

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In Sonoma County, Willow Brook at Penngrove Park in Petaluma had exceeded flood stage. The warning was in effect until 2:45 a.m.

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Residents in affected areas were warned to seek higher ground. The NWS warns never to cross a flooded roadway in an automobile.