Firefighters are gaining ground on three major fires in Los Angeles County, where a red flag warning that went into effect earlier this week for parts of the region was extended into Friday.

"A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior," the NWS said.

Stock image of a wildfire (main) and map of Red Flag Warning in Nebraska (inset). Stock image of a wildfire (main) and map of Red Flag Warning in Nebraska (inset). ISTOCK / GETTY IMAGES PLUS ...