The National Weather Service has issued a severe thunderstorm warning for Sutter and Yuba counties until 1:30 p.m.
Residents reported hail in parts of Sacramento.
Forecasters say there's a storm system off to the southwest of Sacrametno and it's pushing the thunderstorms to the north and northwest.
That system is causing the unsettled weather, which is expected to last through Saturday.
Meanwhile, the National Weather Service in Reno is reporting heavy rain and hail on Interstate 80 near Donnear Lake. Motorists are being urged to drive with care and to watch for slick roads.
1255 PM. I-80 near Donner Lake, Watch for slick roads due to small hail and heavy rain thru 130 pm. pic.twitter.com/teuIpER5Xm— NWS Reno (@NWSReno) May 5, 2016