SANTA ROSA, Calif. (KTVU) - Thursday's storm caused part of a roof and awning to collapse at the Kmart store in Santa Rosa.
It happened around 7:45 a.m., before the store opened.
No one was hurt in the incident, officials said.
Santa Rosa city inspectors checked out the damage, and the stability of the building.
The store opened for the day, but sealed off the electronics and garden sections.
Authorities told KTVU that a combination of dry rot and Thursday morning's storm caused part of the roof and awning to come down.
The National Weather Service is forecasting up to 4 inches of rainfall in Santa Rosa between Thursday and Friday.