IRWINDALE, Calif. (AP) a" Firefighters are racing against the weather to clear brush before heat descends on Southern California, stoking the giant 15-day-old wildfire burning in the Angeles National Forest.
With 19 miles of fireline left to cut in steep and forbidding wilderness, hot and dry conditions on Wednesday pushed plans to set backfires into the night as crews waited for the weather to cooperate.
Containment notched upward to 62 percent and there was no increase in size, said Darryl Jacobs, a spokesman at the fire command post.
The fire has burned across 160,357 acres, or 250 square miles, of the San Gabriel Mountains north and east of Los Angeles since it was started by arson along a forest road on Aug. 26.
At least two dozen helicopters and airplanes were attacking the blaze, along with 3,647 firefighters, as more crews were released back to their home stations.
But since Monday, unpredictable winds have foiled firefightersa plans to use backfires to contain the eastern flank in the San Gabriel Wilderness, an incredibly rugged preserve in the forest where elevations range from 1,600 feet to 8,200 feet and growth ranges from chaparral to pine and fir.
After days of delays due to low humidity, fire officials finally began burn out operations on Wednesday evening, Jacobs said.
Temperatures in the Los Angeles region have been more moderate this week than in the first week of the fire, when high heat and little air movement clamped a smoky lid on the metropolitan area. Breezes from the ocean have since cleared the air and a deep marine layer has moved well ashore during overnight hours.
Morning moisture and dew might also allow helicopters with torches burn through the steep canyons around Mount Wilson and build a substantial buffer around its historic observatory and television, radio and cell phone transmission towers, Jacobs said.
Crews hope to clear brush before warmer and drier conditions return to Southern California on Thursday and Friday, as a high-pressure system builds across Northern California. The National Weather Service predicts inland temperatures will rise into the 90s, with some areas reaching 100, and humidity in mountains will fall to single digit levels.
aItas always a concern when the high pressure builds in,a said fire spokesman Tom De Bellis.
The fire command post was moved eastward this week from Los Angeles to Irwindale, a small industrial city closer to the active east end of the blaze.
Residents of the suburbs below the southern face of the San Gabriels were getting updates on the fireas status online. The Web sites of cities like Sierra Madre, Arcadia, Monrovia, Bradbury, Duarte and Azusa generally advised that there was no immediate threat.
Two firefighters were killed Aug. 30 when their truck plunged off a mountain road, which has made the arson probe a homicide investigation.
The fire has destroyed 78 residences, two commercial properties and 87 outbuildings. It has damaged 13 residences, two communications sites, one commercial property and 30 outbuildings.