A powerful atmospheric river is set to douse Southern California with heavy rainfall, raising significant concerns about mudslides and flash flooding. As 23 million residents are under flood alerts, evacuation warnings have been issued, particularly in burn scar areas such as Palisades and Altadena. The storm is expected to bring a month’s worth of rain in a single day, with the heaviest precipitation anticipated to arrive this weekend. Communities are bracing for dangerous conditions, including potential debris flows and rockslides in fire-affected regions. Live updates indicate that the rain is already beginning to arrive, with meteorologists warning that the wet and cloudy weather will persist for several days ahead.