Los Angeles, California (CNN) -- Four hundred firefighters were converging Friday on a wildfire caused by lightning about 150 miles north of Los Angeles, California, according to the Kern County Fire Department.
At 7 a.m., the fire was about 340 acres, with about 25 percent of it contained, the fire department said.
Department spokesman Sean Collins told CNN on Friday morning that while the blaze threatened some structures, there were no mandatory evacuations.
Two hundred firefighting personnel were on scene, with an additional 200 expected to arrive throughout the morning, the fire department said. Some of the crews will use three water-dropping helicopters and four air tankers in the effort, the department said.
Early responders Thursday night to the scene, between Bodfish and Havilah, California, came from three local fire departments, including Kern County, plus the Bureau of Land Management and the U.S. Forest Service.
Upon arrival, crews were faced with an estimated 80 acres of burning grass and heavy vegetation. Changing winds pushed the fire in all directions and across a road, the Kern County Fire Department said.
CNN's Sara Pratley contributed to this report.