The National Weather Service issued a red flag warning for fire weather in the Bay Area this morning until about 3 p.m. today, with a slight chance of dry thunderstorms in the North Bay Mountains.

The combination of strong winds, low relative humidity and warm temperatures create explosive fire growth potential, according to the service.

Dry thunderstorms provoked hundreds of fires in Northern California on July 22.

San Francisco, Santa Cruz, San Mateo, Marin, Monterey, Contra Costa, Napa, Benito, Sonoma, Santa Clara and Alameda Counties are all affected by the warning.

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