Incoming rain brings mudslides threat to burn zones as crews battle Hughes Fire in Castaic

The Hughes Fire that broke out in Castaic is now 56% contained. As of Friday morning, it has burned more than 10,300 acres.

As of Friday morning, the Border 2 Fire has burned 800 acres and has not yet been contained.

Authorities said crews are dealing with "some extreme fire behavior,'' as blowing embers have started smaller blazes in the area.

The county sheriff's office issued an evacuation order for residents in Dulz at Otay Mountain, and a warning for an area just south of the Jamul
Indian Village, according to a county map.

The sheriff's office posted on social media, "If you feel you are in danger, GO!''

Southwestern College is the evacuation site, and authorities have closed Otay Lakes Road to traffic.

Within 90 minutes of starting, the burn area had grown to roughly 140 acres, officials reported. As of shortly before 7 p.m. Thursday, the fire had spread over an estimated 300 acres, according to Cal Fire.

There were no known structural threats or reported injuries.

The San Diego Sheriff's Department issued road closures in the Otay Mesa area as the fire grew to 600 acres.

Alta Road is closed to traffic just south of Otay Mesa Road due to the rapid growing Border Fire 2 that is burning near the U.S. - Mexico border.

Residents are asked to avoid the area until further notice.

As Southern California prepares for much-needed rain coming this weekend, the precipitation also brings new challenges like toxic ash runoff and mudslides.

Officials are preparing themselves - and residents - for the upcoming rain that is raising concern for possible mudslides that could bring more damage to areas previously hit by the wildfires.

Mayor Karen Bass has issued an executive order to expedite cleanup efforts in burn areas and mitigate the environmental impacts of fire-related pollutants. She ordered crews to remove vegetation, shore up hillsides, install barriers and reinforce roads ahead of the possible weekend rain, which could create mud and debris flows.

While officials say rain could help clear up air quality, the potential for mudslides and toxic runoff filled with debris from the fires is high.

"I think the public health advice that we want to get out there is for folks to be aware of what they need to do to protect themselves from ash and soot and any fire debris," said Nichole Quick, chief medical consultant for the L.A. County Department of Public Health.

"Number one is we want to avoid contact," Quick added. "Whether that be from breathing small particles or contact with skin, eyes and so forth."

The Los Angeles area is expected to get a quarter of an inch to half an inch of rain beginning Saturday, while the mountain communities will see about 2-4 inches of snow.

"This fire burned two feet into the root. There's nothing left to keep the soil in place, and even one drop of rain will come down seven times faster than it would have prior to these fires," said Lisa Derderian with the city of Pasadena.

Officials across the affected areas began preparing Thursday for the upcoming rain by filling and stacking more than 15,000 sandbags, available for residents free of charge.

Thousands of acres of slopes are potential slide dangers now that a lot of the vegetation that anchors the soil is gone. The city hopes people near the fire areas start enforcing their properties as soon as possible, before this weekend's expected rain.

"We have concerns for the next five years on mud and debris flow on this current fire, so there's a lot to do," said Derderian.

Meanwhile, a massive collection of state, county and public utility resources are available at the Santa Anita racetrack. Affected residents can find everything from power equipment to K-rails and more than 400 members of the California Conservation Corps.

"The CCC is launching works that will help mitigate a lot of the debris flow of contaminants into the watershed of Los Angeles County," said Dana Howard with the California Conservation Corps.

Residents can pick up free sandbags at the following locations:

--Altadena Golf Course 1456 east Mendocino Street Altadena, CA 91001
--Victory Park 2575 Paloma Street Pasadena, CA 91107
--Robinson Park 1081 north Fair Oaks Avenue Pasadena, CA 91103
--Las Flores Creek Park 3895 Rambla Pacifico Street Malibu, CA 90265

The Associated Press contributed to this report.