Southern California commuters started off Monday wet, encountering rain that began overnight and will continue into Tuesday.
This storm is expected to bring half-an-inch to an inch of rain, with the coastal foothills getting the most moisture. A flood advisory for Los Angeles County was issued until 10:15 a.m., according to the National Weather Service.
Concerns about mud and debris flows in burn areas has led the city of Duarte to issue a yellow alert for the area affected by last year's Fish Fire. Residents are being told to clear debris around their homes and take to their vehicles off the street.
Resident Peter Bentacourt told KPCC media partner NBC Los Angeles that he's keeping a sharp eye on the hills above his home.
"We don't know how much of that hill is going to come down. And yeah, it had a small time to dry out, but I don't think it's dried out completely. And you know, the hill could give way at any time."
Sheriffs and other city officials will be patrolling the area Monday to make sure its K-rails are holding up and not overflowing with mud and debris.
The California Highway Patrol says it's working 79 calls for service Monday, when the typical day usually sees 40 to 50 calls.
"Calls for service can range from disabled vehicles to rock slides, to overturned crashes and things of that nature, or spin-outs," CHP officer Juan Galvan told KPCC. "So again, just remind everybody to slow down."
Galvan expects the number of calls to increase as more people hit the road.
The LA County Department of Public Health has issued an advisory for all LA County beaches until Thursday at 7 a.m.
Bacteria, debris, trash, and other public health hazards from city streets and mountain areas are likely to enter and contaminate nearby ocean waters through storm drains, creeks, and rivers, so the health department urges people to steer clear of those areas.
Snow levels are above 7,000 feet Monday, so mountain passes are expected to stay open. Winds will blow through the Antelope Valley and L-A County Mountains, with gusts reaching up to 55 miles per hour.
The next storm is predicted to come in on Friday.
This story has been updated.