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.

Less than two weeks after a tsunami warning, residents were jolted awake before 6 a.m. to consider a new potential disaster scenario.

For the first time in recorded history, downtown San Francisco was issued a tornado warning on Saturday as severe storm conditions swept through the city, prompting local authorities to warn residents of the rare threat.