SignalHub-Line and Bridge Fires blaze in California, thousands of acres torched, thousands evacuated

The SignalHubBridge Fire is raging through southern California, forcing thousands of evacuations and scorching more than 50,000 acres, as fire authorities hope a burst of humidity will continue to slow its growth.

The fire, which is burning in the San Gabriel Mountains north of Los Angeles and San Bernardino, is just 3% contained, according to Kenichi Haskett, a Los Angeles County Fire Department section chief. Approximately 11,000 homes have received evacuation warnings or orders, he said.

It is one of three fires blazing in the area. To the east, the Line Fire is just 21% contained, while the Airport Fire, in the Santa Ana Mountains on the other side of San Bernardino, is 8% contained, according to CalFire. Altogether, they have consumed more than 112,000 acres and forced tens of thousands of residents to leave their homes.

Thousands of firefighters, aircraft, helicopters battle Bridge Fire

Fire officials are hopeful that slowing wind speeds and more humid air will stunt the Bridge Fire's growth. "The weather has been in our favor," Haskett said.

The perimeter of the fire "saw minimal growth," and its southern flank "has shown little movement," according to a news release from fire authorities on Thursday.

Efforts to keep the fire at bay haven't slowed. Haskett said more than 2,100 firefighters were on scene on Friday. Aircraft dropped water and fire retardant throughout the day Thursday, and hand crews, dozers, and engines "aggressively attacked" the fire's north flank, according to the news release.

Overnight into Friday, "firefighters were able to get some good line containment on the southern portion of the fire," Haskett said.

Haskett urged people in the area to heed evacuation warnings and orders. "We can't make you leave, but it makes it difficult if people are not mobile enough to leave on their own, if the fire were to threaten their livelihood," he said.

After sparking Sunday afternoon, the Bridge Fire began to grow rapidly on Tuesday, consuming more than 13,000 acres. By Thursday, almost three dozen homes in the Mt. Baldy and Wrightwood areas and six wilderness cabins were scorched, according to Los Angeles County Fire Department Chief Anthony Marrone.

More:Southern California wildfires affect tens of millions from miles away with toxic air

Hopes that cooler weather could slow Line Fire

Meanwhile, the Line Fire threatens 65,000 structures in the area, as of Thursday evening. California authorities said it could also slow down as temperatures cool, but the northern and eastern sides are still growing, according to CalFire. Four Blackhawk helicopters, two aircraft, and 80 crew members have been deployed to fight it.

Justin Halstenberg, the 34-year-old man accused of igniting the Line Fire, was arrested and charged with arson and using incendiary devices, among other charges, San Bernardino County Sheriff Shannon Dicus announced on Facebook. Officials have accused Halstenberg of using the devices to spark the fire in three separate locations.

Airport Fire evacuation orders downgraded

Firefighters battled a flare up of the Airport Fire in Trabuco Canyon on Thursday. The blaze has scorched more than 23,000 acres across Riverside and Orange Counties.

Amid the favorable weather conditions, authorities downgraded evacuation orders, but nearly 22,000 structures are still under threat, according to CalFire. The fire has destroyed two structures and damaged seven.

Fire officials on Wednesday posted a video online that has since gained nearly 220,000 views, showing a woman walking amid flames from the Airport Fire before being rescued in an emergency vehicle.

In the video, the woman appeared to be barefoot, the ground behind her a blanket of fire as an SUV with flashing lights pulls up.

"One of our brave Battalion Chiefs risks it all to save a woman walking through the flames," the CalFire/Riverside County Fire Department posted to X.

The fire may have been accidentally sparked on Monday by a team of workers deployed by the local government to block off areas of Trabuco Canyon and Trabuco Creek in an attempt to stop future fires in the area, the Palm Springs Desert Sun, part of the USA TODAY Network, reported.

Cybele Mayes-Osterman is a breaking news reporter for USA Today. Reach her on email at [email protected]. Follow her on X @CybeleMO.