A flash flood warning issued for parts of Sonoma County has been allowed to expire, a National Weather Service forecaster said.
The warning was issued at about 10:20 a.m. for Willow Brook Creek in Penngrove, near Petaluma.
The threat of flash floods has diminished because the heaviest rain has tapered off and is moving into the South Bay, forecaster Steve Anderson said.
Urban and small stream flood advisories are still in effect for Contra Costa, San Francisco, Alameda, Santa Clara and San Mateo counties.
Moderate to occasionally heavy rains in those areas could lead to flooding of small creeks and streams and ponding of water in low-lying spots and areas with poor drainage, according to the National Weather Service.
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