Brush fire breaks out above Glendora near Angeles National Forest

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A firefighter starts a backfire along San Gabriel Canyon Road in Azusa as the Colby fire burns through brush in January. (Wally Skalij / Los Angeles Times)

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A firefighter starts a backfire with a flare gun along San Gabriel Canyon Road in Azusa as the Colby fire burns through brush in January. (Wally Skalij / Los Angeles Times)

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Firefighters hose down smoldering embers near a home on Pennsylvania Drive as fires continue to burn in Glendora. (Robert Gauthier / Los Angeles Times)

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Firefighters try to protect the main house as a fire burns a section of Singer Mansion on Kregmont Drive in Glendora. (Irfan Khan / Los Angeles Times)

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The Colby fire that broke out in Glendora, on the edge of the Angeles National Forest, exploded in size as dry brush, steep terrain and winds made for rough firefighting conditions. (Irfan Khan / Los Angeles Times)

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Rita Abouchedid covers her face from heavy smoke as fire approaches her home on Kregmont Drive in Glendora. (Irfan Khan / Los Angeles Times)

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Spectators watch as the Colby fire continues to burn on the edge of the Angeles National Forest in January. (Irfan Khan / Los Angeles Times)

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Fire burns a section of Singer Mansion in Glendora as the Colby fire exploded in size Jan. 16. (Irfan Khan / Los Angeles Times)

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Barbara Moser, right, hugs Rita Abouchedid, whose home was threatened by the fast-moving Colby fire in Glendora. (Irfan Khan / Los Angeles Times)

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A statue of Jesus stands in the front yard as the Colby fire claims part of the Singer Mansion in Glendora. (Irfan Khan / Los Angeles Times)

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Firefighters work to protect the main house as a fire burns a section of Singer Mansion in Glendora. (Irfan Khan / Los Angeles Times)

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A large fire plume rises above the downtown skyline from the fast-growing Colby fire from the Baldwin Hills Scenic Overlook. (Al Seib / Los Angeles Times)

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A woman looks at a brush fire that was reported at about 6 a.m. north of Glendora, a foothill community about 30 miles northeast of downtown Los Angeles. (Irfan Khan / Los Angeles Times )

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Glendora resident Cathy Doherty waits to be evacuated in the 500 block of Viewcrest Drive in Glendora as the Colby fire continues to burn. (Mark Boster / Los Angeles Times)

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A brush fire broke out in January in the Angeles National Forest near Glendora. (Irfan Khan / Los Angeles Times)

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A helicopter flies near the Colby fire burning in the Angeles National Forest. (Irfan Khan / Los Angeles Times)

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The Colby fire was reported at about 6 a.m. north of Glendora, a foothill community about 30 miles northeast of downtown Los Angeles. (Irfan Khan / Los Angeles Times)

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A water-dropping helicopter flies over the Colby fire burning in the Angeles National Forest. (Mark Boster / Los Angeles Times)

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Smoke from the Colby fire in Glendora casts an eerie red glow in front of the rising sun in San Gabriel. (Gary Friedman / Los Angeles Times)

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A police cruiser drives down Viewcrest Drive in Glendora urging residents to evacuate as the Colby fire burns in the Angeles National Forest. (Mark Boster / Los Angeles Times)

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A large plume from the fast-growing Colby fire can be seen from as far away as Beverly Hills. (Al Seib / Los Angeles Times)

By Ari Bloomekatz

Jan. 16, 2014 6:38 AM PT

About five dozen firefighters have been dispatched to a brush fire that broke out in the hills above Glendora near the edge of the Angeles National Forest early Thursday morning.

The fire started just before 6 a.m. near the intersection of Glendora Mountain Road and Colby Trail Motorway, said Miguel Ornelas of the Los Angeles County Fire Department.

Ornelas said that although the blaze was technically in Glendora, forest crews were also joining in the fight.

UPDATE: 3 people in custody in connection with wildfire

There was no immediate estimate of the size of the fire or when crews might have it under control.

The fire comes as the National Weather Service extended red flag warnings for Los Angeles and Ventura counties until 3 p.m. Friday with extremely low humidity worsening already tinder-dry conditions.

The circumstances are such that if a fire were to ignite, “there could be rapid spread of wildfire,” the weather service warned Thursday.

PHOTOS: Colby fire rages near Glendora

The weather service said the unseasonably warm weather and Santa Ana winds were the result of high pressure near the surface of the Great Basin coupled with high pressure aloft just west of Southern California, blocking storm systems from reaching the region.

Twitter: @aribloomekatz | Facebook

ari.bloomekatz@latimes.com

Brush fire breaks out above Glendora near Angeles National Forest

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