The Red Flag Warning means there's a higher risk of fire, in part, because of the winds from the north, which are expected to develop Friday evening and continue through Saturday afternoon.
In L.A. County, the red flag warnings are in effect in the San Gabriel Mountains, the Angeles National Forest, the Santa Monica Mountains, and the San Fernando and Santa Clarita valleys.
With critical fire weather incoming, Cal Fire is taking extra steps to make sure it has the resources and manpower available to respond to fires over the weekend.
A rapid fall in humidity will take place Saturday morning as Santa Ana winds gust into the region, the service said. Ventura County is under a Fire Weather Watch Saturday morning through Sunday evening as the Santa Ana Winds in Ventura County pick up, gusting up to 50 miles per hour.
Red flag warnings are issued for areas where "extreme fire behavior" may occur within 24 hours. Including the San Gabriel mountains.
In Orange County, partly cloudy skies were expected along the coast but sunny skies were in the forecast in the county's inland sections.
We are starting the day with weaker winds but that won't last for long as the winds will pick up once again giving us high fire danger going into the weekend.
Winds will increase through Saturday morning, reaching their peak in the middle of the day, then peaking again early Sunday.