A red flag warning for Orange County has been issued by the National Weather Service in San Diego. The warning means that conditions are optimal for spread of a wildfire.
The warning has been issued through Sunday, 6 p.m., for Orange County, western Riverside County, and southwestern San Bernardino County mountain and valley areas.
The reason for the warning is strong gusty winds and very low relative humidity with little overnight recovery.
Winds are northeast 15-25 mph, with gusts 30-40 mph, according to the NWS. The strongest winds, of 50-65 mph, will impact canyons and passes in Orange County.
The relative humidity is in the 5-10 percent range.
The strongest and most widespread winds will be Friday night and Saturday morning. Winds for Saturday afternoon through Sunday night will decrease by 10-20 mph but will continue to have local gusts 30-40 mph.