A new fast-moving wildfire has erupted in Los Angeles County, prompting tens of thousands to evacuate a region already reeling from the most destructive fires in its history.

The Hughes fire ignited about 45 miles north-west of the city of Los Angeles on Wednesday morning, near Castaic Lake in a mountainous area that borders several residential areas and schools.

The blaze grew to more than 9,200 acres in several hours on Wednesday, fuelled by winds and dry brush. No homes or businesses have been damaged, and fire officials expressed confidence about getting the blaze under control.

The new fire is located north of the two mammoth blazes - which are still burning - that destroyed multiple neighbourhoods in the Los Angeles area earlier this month.

Local news showed residents near the Hughes fire hosing down their homes and gardens with water and others rushing to evacuate neighbourhoods.

The region is once again under a red flag warning, which cautions of a high fire risk due to strong winds and dry, low-humid conditions.

Winds in the area were blowing around 20 to 30mph (32 to 48km), but could pick up, which would fan the blaze and make it harder for air crews to operate.

About 31,000 people in the area are under a mandatory evacuation order and another 23,000 have been warned they may have to flee, Los Angeles County Sheriff Robert Luna said. A jail in the area was evacuating nearly 500 inmates at the facility, he added.

The fire continued to grow as the sun set, but Los Angeles County Fire Chief Anthony Marrone said he believed crews were making progress.

"The situation remains dynamic, and the fire remains a difficult fire to contain, although we are getting the upper hand," he said.

Chief Marrone explained how different this fire is compared to the Palisades and Eaton fires, which killed at least 28 people and decimated more than 10,000 homes and businesses earlier this month.

He said it was a mix of lower winds - unlike the 70 to 90mph winds seen during the previous fires - and having so many helicopters and planes able to fight the blaze from above.

"I think that we've all been on edge over the last 16 days," he said. "We were able to amass a lot of fire resources early on to change what this fire looks like."

Getty Images Emergency crews patrol along a street as flames and smoke billows into the air in the distanceGetty Images

Ed Fletcher, who works for Cal Fire - California's statewide fire agency - told the BBC that this fire was different than those earlier this month. The winds are not as strong yet, he said, and there are a lot of crews trying to tame the flames.

Mr Fletcher noted the area is not highly populated and current winds are blowing the fire toward Castaic Lake, which is acting as a buffer between the Castaic area - home to about 20,000 residents.

One woman who evacuated her home told NBC 4 that she was stuck on Interstate 5, California's primary transportation highway that runs through the state. Parts of the interstate in the area had been closed due to the fire.

"It looked like a cloud, but as you got close, it looked like we were driving into hell," she said of the dark smoke and red flames she saw. ?It was pretty terrifying to be honest with you.?

They are both smaller ? 85 acres for the Lilac fire near Oceanside and 3.9 acres for the Center fire ? but were burning in populated areas. Fire crews appeared to have a handle on both of the blazes and evacuation orders had been mostly lifted.

Dana Dierkes, a spokesperson for the Angeles National Forest, noted the winds and dry brush have made these recent fires much harder to fight.

?We don't have a fire season in California. We have a fire year,? she said. ?We've had wildfires in January before, but it's exacerbated by the Santa Ana winds. The wind is a huge factor when we've had such a dry year.?

Rain is in the weekend forecast in the region, a welcome bit of news to douse the fire threat. But the rainfall is bringing new fears in the form of mudslides, flooding and landslides.

Areas touched by the recent fires are particularly at risk because torched grounds aren't as absorbent.

Governor Gavin Newsom signed an executive order on Monday to help free up resources for flood and landslide preparation after the fires. (BBC)

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