A powerful storm system has moved into the United States, causing widespread evacuations and alerts in California, particularly in the Los Angeles area. Residents in burn scar zones are being urged to evacuate amid fears of mudslides and flooding as heavy rain and snow are expected throughout the week. The National Weather Service has issued flood watches, and evacuation orders have been put in place for areas including Hollywood Hills and the Palisades Fire zone. Crews are on standby to respond to emergencies, as both frigid weather and possible tornadoes threaten the region. Authorities are preparing for significant rainfall, with some forecasts predicting hazardous conditions, including debris flows and heavy snow in mountain passes. This atmospheric river event marks the beginning of what is anticipated to be back-to-back storms impacting Southern California.