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At a Glance Heavy rain fell on multiple large burn scars Tuesday morning in Southern California.

Mudslides, rescues and a fire were reported among the flooding Tuesday.

At least 13 people have died in the mudslides.

Santa Barbara County officials confirmed at least 13 deaths Tuesday morning as a powerful storm that hit Southern California triggered flooding rainfall and mudslides on hills left barren by recent wildfires.

At least five of the deaths occurred in Montecito, where several homes were knocked off their foundations and destroyed by the mud flows, according to authorities.

Officials said there were 25 injuries and crews performed 50 rescues. One such rescue was a boy who was found under an overpass Tuesday morning , according to the New York Times.

"That kid that was carried probably a third of a mile downstream," Eliason told the Times. "His father is still missing."

(MORE: Where We Expect Additional Rain to Fall )

Eliason confirmed to the Los Angeles Times that a fire was sparked by a gas main break earlier in the morning, and several homes were destroyed by the blaze. He also told the L.A. Times that there were reports of missing people, but added "we're still hoping that's not the case."

"Mud came in an instant, like a dam breaking ," Montecito resident Ben Hyatt told CNN. "(It) surrounded the house, 2 to 3 feet."

More than 30,000 homes and businesses were without power statewide Tuesday morning, but most of those outages were in Southern California. With so many roads impassable because of downed trees and power lines, crews had to rescue some trapped residents by helicopter, according to the AP.

It was the first notable rainfall during the region's rainy season, and the first time heavy precipitation fell since a series of large wildfires scorched hundreds of square miles. As the heaviest rain bands centered over Santa Barbara County, officials urged residents to "shelter in place or move to higher ground " instead of attempting to flee any fast-moving mudflows.

Between Ventura and Santa Barbara, a 30-mile stretch of U.S. 101 was closed in both directions Tuesday morning because of flooding on the roadway and the risk of mudslides , the California Highway Patrol announced via Twitter.

Authorities Order Residents to Evacuate

Mandatory evacuations were issued for vulnerable locations of the Thomas Fire and Whittier Fire burn scars, Santa Barbara County officials announced. Voluntary evacuations have been issued for several other areas.

"Flash floods, mud and debris flows can happen with little or no warning. It is important that you understand the seriousness of the situation and follow the direction of authorities," said a statement from Santa Barbara County.

Flight shuttles were brought in to evacuate people out of Montecito Tuesday, Disaster Assist Team representative Tay Austin announced via Twitter. Each shuttle had the capacity to carry 10 people.

Officials in the city of Duarte ordered roughly 180 homes to evacuate near the Fish Fire burn area, CBS Los Angeles reported.

(MORE: 8 Reasons Why Rain Is a Big Deal in Southern California )