A powerful atmospheric river unleashed torrential rains on Northern California overnight from December 21 to 22, 2025, triggering severe flash flooding in Shasta County that claimed at least one life and prompted multiple water rescues in the Redding area. The deluge, which dumped 3 to 6 inches of rain in just hours, submerged roads, stranded vehicles, and knocked out power for thousands, turning everyday streets into hazardous waterways.