The National Weather Service has issued a Red Flag Warning for parts of Los Angeles County as thunderstorms added a new wrinkle to the heat wave on Saturday morning.

The warning , in effect until 9 p.m., spans several mountainous areas of Southern California, such as the Santa Clarita Valley and San Gabriel Mountains. A NWS bulletin described the fire conditions as extreme, due to dried out fuels from the heat wave combined with sporadic lightning strikes.

"If fire ignition occurs, conditions are favorable for extreme fire behavior and rapid fire growth, which could threaten life and property," the bulletin reads. "Be aware of sudden re-direction of fires in response to passing outflow boundaries."

As of Saturday morning, at least four fires in the Angeles National Forest have started

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