Winds of about 30 knots and swells of up to 8 feet (2.5 meters) were reported around the time the 27-foot (8-meter) gold Chris-Craft vessel flipped over near the lake's southwest edge, Coast Guard officials said.
Rescue workers and divers searched the area Saturday evening and resumed their search Sunday morning before the Coast Guard suspended its search.
Video obtained by KCRA-TV showed moored boats at a nearby marina crashing into one another amid strong gusts. The extent of the damage wasn't immediately known Sunday.