San Francisco residents were woken up by a tornado warning early Saturday morning during a powerful storm system that battered the region with heavy rain and wind.

Powerful storms swept through parts of Northern California on Saturday, knocking down trees, causing widespread power outages and prompting weather officials to issue what they said was the first-ever tornado warning for San Francisco.

A tornado warning was issued by the NWS San Francisco CA on Saturday at 5:51 a.m. "At 5:51 a.m., a severe thunderstorm capable of producing a tornado was located near Daly City, moving northeast at 45 mph,