At around 9:30 a.m. this morning, a developing funnel cloud touched down at Ocean Beach. There's mildly jarring footage of it, too! NBC Bay Area explains: "The tornado on the water was captured on video off Ocean Beach in San Francisco by Rick Gutierrez. He posted it on YouTube with a caption that explained it was taken Friday at 9:24 a.m. 'I was looking outside my window. There was a very dark cloud and there it was,' Gutierrez wrote.The tornado on the water was captured on video off Ocean Beach in San Francisco by Rick Gutierrez. He posted it on YouTube with a caption that explained it was taken Friday at 9:24 a.m. 'I was looking outside my window. There was a very dark cloud and there it was,' Gutierrez wrote."

And here it is:

Earlier this morning, the National Weather Service issued a tornado warning for San Mateo County from 11:02 to 11:30 a.m.