More rain is falling on parts of Southern California after causing mudflows over the weekend. The rain is helping firefighters but boosting the risk of toxic ash runoff in areas scorched by Los Angeles-area wildfires.

Rain was falling across Southern California on Sunday, bringing some relief to thousands of firefighters battling multiple major blazes for nearly a month in the Los Angeles area, but also prompting new threats of floods and mudslides across burn-scarred lands.

"That could be enough to create debris flows." The rain started along the Central Coast before moving into Ventura and LA counties in the evening. It was forecast to increase throughout the weekend and possibly last into early Tuesday,