A fire danger warning in Southern California. Photo by Chris Jennewein.

A forecast of gusty Santa Ana winds and single-digit humidity led the National Weather Service to issue a red flag warning for San Diego County starting Thursday morning.

Northeast winds are forecast to reach 35 to 45 mph near mountain passes, with gusts to 55 mph possible. High winds combined with relative humidity below 10 percent everywhere but along the coast will make for dangerous fire conditions.

“Any fires that develop will likely spread rapidly, with extreme fire behavior possible,” the weather service said.

The fire weather conditions are expected to continue through Friday evening, and the weather service warned that “a second burst of moderate strength Santa Ana winds is looking more likely Sunday and Monday.”

Updated at 10:10 a.m., Wednesday, Nov. 7, 2018

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Chris Jennewein

Chris Jennewein is Editor & Publisher of Times of San Diego.