People in parts of Southern California are being ordered to evacuate. This time, it's because of rain.
The storm is hitting some of the same areas ravaged by wildfires near the end of 2017.
And that's what makes the situation more dangerous. The wildfires that engulfed hundreds of thousands of acres last year took vegetation and protective brush along with them, leaving the areas more susceptible to mudslides and debris flow.
Officials say they've already had to rescue people from vehicles and buildings. They also report waist-deep mudflow and downed trees and wires in some areas.
Additional reporting from Newsy affiliate CNN.