More than 1 million people in the Bay Area were under the brief tornado warning, which was lifted by 6:15 a.m.

The San Francisco Recreation and Parks Department has confirmed that 73 trees at city parks were downed as a result of Saturday's storm, with at least 50 of those trees located at the west end of Golden Gate Park.

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.

San Francisco experienced its first-ever tornado warning early Saturday, stunning residents as a powerful storm swept through the Bay Area, bringing heavy rain and winds. The warning prompted a flood of social media posts from residents startled awake by emergency alerts.

The major windstorm overnight​ caused big problems in many parts of San Francisco. City workers were overwhelmed by the amount of downed trees and power lines.