The ongoing deluge of storms in Northern California has swelled lakes and dams, boosting the prospects for outdoor recreation but likely falling short of ending the drought. Heavy rain hit the region north of San Francisco on Thursday with four inches expected by Friday, the National Weather Service said. In Santa Rosa, the storm caused a partial roof collapse at a Kmart store. No injuries were reported.

Flash-flood warnings were issued for swelling rivers and streams in Marin and Sonoma counties north of San Francisco.