President Trump approved a disaster relief declaration on Friday for California, where wildfires that engulfed several mountains around Los Angeles and the San Fernando Valley earlier this week continue to burn out of control.

Local officials said wind gusts between 70 and 80 mph, along with low humidity, have created difficult conditions for firefighters to keep the flames from spreading into more populated areas. Nearly 200,000 people have already been affected by the fire or were forced to evacuate their homes.

California's Democratic Gov. Jerry Brown wrote a letter to Trump early Friday asking him to declare a state of emergency to ensure federal resources are available for counties that remain affected by the fires.

"I have determined this incident is of such severity and magnitude that continued effective response is beyond the capabilities of the state and affected local governments and supplemental federal assistance is necessary to save lives and to protect property, public health and safety, and to lessen the effects of this imminent catastrophe," Brown wrote.

Trump responded Friday by authorizing the Federal Emergency Management Agency to provide equipment and various other resources, and fund 75 percent of those efforts in the affected areas in California.

"This action will help alleviate the hardship and suffering that the emergency may inflict on the local population, and provide appropriate assistance for required emergency measures," the White House said in a statement.

The president offered his condolences earlier this week to families and first responders who have suffered because of the wildfires while encouraging others "to heed the advice and orders of local and state officials."