High Risk for Flooding: indicates a rare Level 4 out of 4 risk for excessive rainfall, now expanded to include Los Angeles, Santa Barbara, and Oxnard in Southern California. The Weather Prediction Center warns of life-threatening flash and urban flash flooding, with rainfall rates up to an inch per hour expected, resulting in 3 to 6 inches of rain across the region. Coastal California, including San Francisco, faces a more widespread Level 3 risk.

Significant Rainfall in Los Angeles: Central and Southern California are expected to experience widespread rainfall totals of 3 to 6 inches, surpassing a month’s worth of rain for most areas. There are indications that the storm may match the strength of Tropical Storm Hilary from last August, according to Los Angeles Mayor Karen Bass. Residents are advised to take common-sense precautions.

Evacuation Orders Issued: Mandatory evacuation orders have been issued for communities in Santa Barbara, San José, Los Angeles, and Ventura County. Officials warn of potential life-threatening floods and landslides. Several school districts in Santa Barbara County have canceled classes due to the severe weather.

Hurricane Force Wind Warning: The National Weather Service in San Francisco issued its first-ever hurricane force wind warning, with widespread winds of 40 to 60 mph expected throughout the state. Some gusts may reach as high as 95 mph in the foothills and mountains. Wind advisories and high wind warnings affect nearly 30 million people in inland areas across the state.

Atmospheric River and Prolonged Rainfall: The current atmospheric river, following a recent storm, brings a prolonged period of rain. Expected to stall upon moving onshore, the worst of the storm is forecasted between Sunday and Tuesday. Parts of the central and southern coastline, including Los Angeles and San Diego metro areas, are at risk of significant rain and flooding.

Warnings and Precautions: The National Weather Service emphasizes the threat to lives and property due to damaging flooding. Roads may flood, and there could be major rises on creeks, streams, rivers, as well as mudslides and debris flows. Residents are urged to exercise caution and avoid flooded roadways.

Government Response: California Governor Gavin Newsom is actively monitoring the situation, with the state prepared with winter equipment, swift water rescue teams, and National Guard members. The state has prepositioned over 7 million sandbags and is ready to provide shelter and food for over 37,000 people.

Coordination Efforts: Tony Tavares, director of the California Department of Transportation, states that the department is coordinating efforts across multiple state departments and agencies. With over 4,000 personnel and storm equipment strategically placed, efforts are underway to address diverse challenges, including monitoring wildfire burn scar areas and responding to snow, ice, and flooding.

Urgent Preparedness: Nancy Ward, director of the California Governor’s Office of Emergency Services, emphasizes the dangerous nature of the upcoming storms. With over 8,500 personnel deployed statewide, including swift water and helicopter rescue teams, the state is ready to respond to potential calls for help. Ward highlights the storms as the most dangerous natural disasters, posing risks greater than wildfires.

Onshore Winds Impact: Powerful onshore winds are expected to impact northern and central California, shifting to southern California. Wind advisories and high wind warnings cover almost the entire state, affecting nearly 30 million people.

Growing Power Outages: PowerOutage.us reports that more than 800,000 customers are without power in California, with outages rapidly increasing, particularly along the coast, as rain and strong winds intensify. Blackouts are expected to rise, especially in central and southern portions of California.

Flight Delays and Cancellations: San Francisco International Airport experiences delays and cancellations, with at least 143 incoming and 122 outgoing flights affected. FlightAware reports 100 flights canceled on Sunday.

Impact on Events: NASCAR and PGA events scheduled in California over the weekend are canceled due to severe weather. NASCAR moved the Busch Light Clash at the Los Angeles Memorial Coliseum from Sunday to Saturday night, while the PGA Tour postponed the Pebble Beach Pro-Am golf tournament’s final round to Monday.