A storm that rolled through Southern California Thursday caused flooding, mudslides, power outages and gridlock on the region's freeways.

The heavy rains triggered debris flows in Orange and Riverside counties, and caused a mudslide in Malibu on Cuthbert Road between Horizon and Busch drives.

Video footage from Malibu showed mud streaming down a hillside into an area charred by the Woolsey fire. As a result, Los Angeles County authorities ordered evacuations in Malibu and urged residents below wildfire burn areas to remain alert until the storm subsided.

Meanwhile in the Inland Empire, heavy rains caused flooding and prompted mandatory evacuation orders in parts of the Temescal Valley and Lake Elsinore, where schools were closed due to the storm. However, there were no reports of significant damage.

The Lake Elsinore Unified School District shuttered Luiseno Elementary School, Rice Canyon Elementary School, Withrow Elementary School, Terra Cotta Middle School and Lakeside High School, all of which are situated in or near residential areas under mandatory evacuation because of flooding, mud and debris flow risks. 

The rains also caused heavy runoff in the Cleveland National Forest, and multiple roads were closed between Corona and Lake Elsinore because of pooling water.

The rain also brought traffic to a standstill on freeways across the region, with the National Weather Service issuing an advisory urging drivers to reduce speeds.

The city of Los Angeles was particularly hard hit during the morning community, with crashes bringing traffic to a standstill on the 101 Freeway South at Western Avenue, the 405 Freeway North between Ventura Boulevard and the 101, as well as on the 118 Freeway West between De Soto Avenue and Rocky Peak Road.

Things weren't much better in other areas.

A crash blocked two left lanes on the 210 Freeway West at Foothill Boulevard. An injury crash was reported along the right shoulder of the 91 Freeway East at 14th Street, and a crash was reported in the left lane of the 22 East at the 5, with traffic backed up to Fairview.

Back in L.A. County, the storm knocked out power in parts of Porter Ranch, Woodland Hills, North Hollywood and Vermont Knolls.

At 6:02 p.m., the Los Angeles Department of Water and Power tweeted: "Porter Ranch and North Hollywood power has been restored. If you are still experiencing a power outage please check your breakers or call it in to 1800 DIAL DWP."

The DWP also urged residents in Hollywood to be careful because of downed power lines in the vicinity of North Martel Avenue.

The National Weather Service said showers were expected throughout the night, with clouds moving in Friday.

A second, weaker storm is expected to bring rain Saturday afternoon into Sunday morning.

City News Service contributed to this report.