An “extremely dangerous situation” was unfolding in the Hollywood Hills area and around the Santa Monica Mountains Monday, as a powerful, slow-moving storm triggered mud flows and debris flows that damaged some homes and forced residents to evacuate. Damage reports piled up early Monday as the storm system steadily pummeled Southern California, and downtown L.A. broke a 97-year-old rainfall record. On Sunday, downtown had seen 4.1 inches of rain, which broke the record for the calendar day set on Feb. 4, 1927, when 2.55 inches of rain was recorded. Sunday was the third wettest February day on record and tied for the 10th wettest day for any time of year since record keeping began in 1877, the National Weather Service said.

Related articles: 

• The New York Times: For California, ‘one of the most dramatic weather days’
• San Francisco Chronicle: California storm: Bomb cyclone winds continue, thousands without power
• ABC News: Life-threatening flooding pummels Southern California
• ABC 7 – Los Angeles: Southern California under state of emergency as evacuation orders, warnings in effect
• CBS 13 – Sacramento: Atmospheric river hits the Sacramento region, bringing heavy rain, snow and powerful wind​ 
• Office of Gov. Newsom: Press release - Newsom proclaims state of emergency in Southern California as powerful storm makes landfall