Shane Sherwood with the Orange County Fire Authority said the evidence gathered led them to believe the fire was an intentional act, but are still working through the evidence to determine how it was started. One then swoops in low behind a row of houses before opening its bay doors and dumping its load of flame retardant liquid over the ground.
The Holy Fire has scorched 18,137 acres and was 5% contained, the forest said on its Twitter page on Friday morning.
The Mendocino Complex fire has been declared the largest in state history.
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The blaze north of San Francisco has grown to the size of Los Angeles since it started two weeks ago, fueled by dry vegetation, high winds and rugged terrain that made it too unsafe for firefighters to directly attack the flames now spanning 470 square miles.
That could become a real possibility, as the fires in California aren't very well contained at the moment and may continue to burn for a considerable amount of time.
Clark made several outbursts, claiming his life was being threatened and said the arson charge against him was a lie.
The Shasta-Trinity National Forest and Whiskeytown National Recreation Area are among the areas that have been affected by the Carr Fire, which has killed 8 people and forced tens of thousands to evacuate. He is now expected to appear in court Friday and is facing life in prison if convicted.
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"I was asleep. I had two earplugs in", he said.
Martin Lovrin, a Mendocino Complex Fire evacuee, rests at a makeshift shelter on Wednesday in Clearlake, California.
Some evacuations have been ordered, according to the U.S. Forest Service. But Cal Fire said the flames are out of control to the north, roaring into remote and unpopulated areas of thick forests and deep ravines as firefighters contend with record-setting temperatures.
Clark was arrested late Tuesday on two counts of felony arson, one count of felony threat to terrorise and one count of misdemeanour resisting arrest, said Susan Schroeder, spokeswoman for the Orange County district attorney's office.
According to the National Weather Service, smoke from the fires has actually made it's way across the country - all the way to the East Coast.
"Our main focus this afternoon was getting everyone out safely", said Thanh Nguyen, a spokesperson for the crews battling the Holy Fire. Later came another expletive-laden text that ended with the ominous warning: "The place is going to burn just like you planned".
Cleveland National Forest officials tweeted that the Southern California fire is growing as fast as crews can build containment lines. The fire had consumed more than 305,000 acres in Northern California, or 476 square miles - an expanse almost as large as the city of Los Angeles.