JUNIPER HILLS — An enormous wildfire that churned through mountains northeast of Los Angeles and into the Mojave Desert was still threatening homes on Monday, but officials said calmer winds could help crews corral the flames.

At 165 square miles, the Bobcat Fire is one of the largest ever in Los Angeles County and it has burned for more than two weeks. It’s just 15% contained.

Evacuation orders and warnings are in place for thousands of residents in foothill and desert communities, where semi-rural homes and a popular nature sanctuary have burned. No injuries have been reported.

Erratic winds that drove flames into the community of Juniper Hills over the weekend had died down, said U.S. Forest Service fire spokesman Larry Smith.

“It’s slightly cooler too, so hopefully that will be a help to firefighters,” Smith said.

Officials said it could be days before teams determine the scope of the destruction in the area about 50 miles northeast of downtown Los Angeles.

Firefighters fought back against another flareup near Mount Wilson, which overlooks greater Los Angeles in the San Gabriel Mountains and has a historic observatory founded more than a century ago and numerous broadcast antennas serving Southern California.

Nearly 19,000 Firefighters in California Are Fighting More Than Two Dozen Major Wildfires

The Bobcat Fire started Sept. 6 and has doubled in size over the last week. The cause is under investigation.

The wildfire also destroyed the nature center at Devil’s Punchbowl Natural Area, a geological wonder that attracts some 130,000 visitors per year. A wildlife sanctuary on the property was undamaged, and staff and animals had been evacuated days earlier.

Nearly 19,000 firefighters in California are fighting more than two dozen major wildfires. At least 7,900 wildfires have burned more than 6,000 square miles in the state this year, including many since a mid-August barrage of dry lightning ignited parched vegetation.

Officials were investigating the death of a firefighter at another Southern California wildfire that erupted earlier this month from a smoke-generating pyrotechnic device used by a couple to reveal their baby’s gender.

The death occurred Sept. 17 in San Bernardino National Forest as crews battled the El Dorado Fire about 75 miles  east of Los Angeles, the U.S. Forest Service said in a statement. That blaze is 59% contained.

In Wyoming, a rapidly growing wildfire in the southeastern part of the state on Sunday closed in on a reservoir that’s a major source of water for the state’s capital city, Cheyenne.

The water system remained safe and able to filter out ash and other burned material that flows through streams and reservoirs after wildfires, said Clint Bassett, water treatment manager for the Cheyenne Board of Public Utilities.