Dec. 14, 7 p.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.

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.

A potent winter storm targeting Northern California this weekend brought what appears to be the first official tornado warning on record for the city of San Francisco on Saturday morning.

A wide area of freezing rain created dangerous travel conditions in the Midwest and Plains Saturday morning with dozens of crashes reported, and hours-long closures of major interstates.

Inclement weather has plagued areas of the U.S. in the first half of the weekend, with dangerous conditions including heavy snow, a major ice storm and unsual tornado activity