The Record fire burning in San Jacinto was 15% contained on Monday, after burning 517 acres overnight, and residents in the Poppet Flats area were issued an evacuation warning, according to the Cal Fire/Riverside County Fire Department.

Fire officials initially mapped the fire’s footprint at 650 acres, but that number was reduced to 517 on Monday, Cal Fire/Riverside County Fire Department spokesperson Rob Roseen said.

While there was minimal fire and smoke on Monday, Roseen said 175 firefighters were fighting the fire and working in triple-digit heat to cut line around the fire, which ignited at 2:23 p.m. on Sunday, near Soboba and Gilman Springs roads at a transient encampment.

Twenty-one engines, two helicopters, four dozers, and one water tender were working the fire on Sunday, according to the Fire Department.

“We’re working in some very rugged terrain, and it got up to about 110 today,” Roseen said.

Officials have not confirmed whether the fire was accidentally or intentionally set.

About 200 homes in the Poppet Flats area were threatened by the fire, and residents in that neighborhood above the Soboba Casino were issued evacuation warnings.

Residents on San Jose and Chabela drives, near where the fire ignited and above the road closure at Soboba Road, said the fire came close, but they were not among the residents given evacuation notices.

Robert and Andrea Figueroa, who live in a condo complex adjacent the hillside on San Jose Drive, said the fire was one of two that burned in the area in the last year. They said they were concerned about safety, especially because they have a 2-month-old daughter and because the terrain is tinder dry.

“It’s just very dry,” said Andrea Figueroa, who first realized there was a fire nearby on Sunday when she started smelling smoke.

“Then I heard the helicopters,” she said.

Helicopters support ground crews throughout the day by doing water drops to cool down hot spots and slow the fire’s spread, according to the Fire Department.

At the time of the initial report, the upslope-burning fire was estimated at 5 acres but grew to 650 acres by 7:30 p.m., according to the Fire Department.

Six firefighters suffered minor injuries battling the blaze on Sunday. An update on their condition was not available Monday.

The Riverside County Sheriff’s Department has assisted with road closures and planned to maintain the closure of Soboba Road and Chabela Drive throughout the day on Monday, with Soboba Road being closed between State Street and Lake Park Drive, Sgt. Wenndy Brito-Gonzalez said.

Roseen said extreme heat conditions were the biggest concern for firefighters on the front lines battling the blaze, and the Fire Department will ensure that firefighters are sticking to work-rest cycles.

“We want to make sure they have an opportunity to come off the line, get some rest and be ready for the firefight ahead. There’s going to be some extreme heat they’re going to be working through,” Roseen said.

He said winds were expected to kick in later Monday, between 7 to 10 mph, increasing the potential for the fire to spread beyond its 650 acres.

The National Weather Service issued an excessive heat watch alert for Riverside County valleys on Monday, indicating “dangerously hot” conditions with high temperatures between 104 and 112 degrees.

Residents in the fire area are urged to stay vigilant and be prepared to evacuate if necessary.

City News Service contributed to this report.