Flood warning sirens were activated in San Anselmo tonight (map) as San Anselmo Creek approached flood stage after a day of heavy rain.

Hours more rain is forecast for tonight, so police and firefighters were going to local businesses to warn them, and authorities also activated a phone warning system, according to broadcast news reports and the Marin Independent Journal newspaper.

The town, about 15 miles north of the Golden Gate Bridge in Marin County, regularly floods after prolonged rains. The local fire department has a web page with live reports of the creek level, but the site was experiencing heavy use tonight and was difficult to reach.