California Declares State of Emergency as Catastrophic Storm Threatens 40 Million Residents

California Governor Gavin Newsom declared a state of emergency on December 24, 2025, as a powerful bomb cyclone and atmospheric river storm system threatens to bring catastrophic flooding to the state. The storm, which began impacting California on Christmas Day, carries the potential for 4-8 inches of rain in some areas and could produce record-setting rainfall rates of up to 1.5 inches per hour. With 40 million residents potentially affected, authorities have issued multiple flood warnings and urged immediate preparations. The National Weather Service has warned this could be California's worst flooding event in decades, with particular concern for areas affected by previous wildfires where burn scars increase landslide and mudflow risks. Emergency management officials have activated response teams and are monitoring river levels closely as the storm moves inland from the Pacific.