HIGHLAND, Calif. (KABC) -- A brush fire fueled by hot temperatures and dry brush that has triggered sweeping evacuation orders and warnings exploded in size in the Highland area, growing to 20,553 acres by Sunday evening.
The Line Fire started Thursday evening, but the flames really kicked up and quickly spread Saturday as winds shifted and lightning strikes hit the area. Communities in the area were ordered to evacuate and roads were shut down.
According to the Cal Fire website, at least three firefighters have been injured, but details on their conditions were not released.
No homes have been reported destroyed as of Sunday, but more than 36,000 structures were threatened in the area including residential homes, commercial buildings and other minor structures.
Containment was at 0% as of Sunday night.
Gov. Gavin Newsom proclaimed a state of emergency in San Bernardino County for the fire, and announced new federal grant money to help fight the blaze. The emergency declaration allows the government to waive certain regulations, letting people impacted by the fire to gain quicker access to unemployment benefits, for example, or obtain records they lost such as marriage and birth certificates. It also waives certain regulations on hospitals and child care facilities.
The state has also obtained a Fire Management Assistance Grant from FEMA, Newsom said. The grant allows local agencies to apply for reimbursement of up to 75% of their firefighting costs.
Officials say the blaze was generating its own weather conditions, as pyrocumulus - also known as fire clouds - formed overhead. The National Weather Service says some 3,700 lightning strikes were recorded in the clouds - and more than 270 lightning strikes on the ground which had the potential to ignite new blazes.
Thunderstorms were creating down drafts which were pushing the blaze in unpredictable directions, according to Chris Prater with San Bernardino County Fire.
"Firefighters are fighting a very tough battle," Prater said. "They're fighting in 100-plus degree temperatures. Very steep terrain. And some new weather conditions today with thunderstorms that came in."
Authorities issued evacuation orders and warnings that remained in place Sunday. Multiple road closures are also in place.
Meanwhile, the cause of the fire is under investigation.