Dozens of lightning strikes were spotted and reported south of the Bay Area Wednesday evening.
Viewer William Justo captured a stunning video of lightning and a rainbow in Hollister.
Firefighters were on alert as this type of weather can spark brush fires in an instant.
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Lightning was also spotted in other parts of California.
In Los Angeles County, a woman and two dogs were killed by a lightning strike Wednesday morning as thunderstorms pounded Southern California, the Los Angeles County Sheriff's Department said.
The thunderstorms were caused by a low-pressure system off the coast pulling monsoonal moisture northward into the region, meteorologists said.
According to Chief Meteorologist Jeff Ranieri, there was a massive amount of lightning just south of Gilroy. He added it was slowly moving northwest and getting hung up on mountains.
Associated Press contributed to the report.