With dry, desiccating offshore winds developing in the San Francisco Bay Area during a severe early-autumn heat wave, officials warned Friday that the risk of wildfire sparks and spread is high. The National Weather Service issued a red flag warning just before 11 a.

More than 200 October record highs have been set and extreme temperatures are poised to persist for several more days.

“All of the heat warnings and advisories — they’ve all been extended,” NWS meteorologist Nicole Sarment said. “We’ve got a tiny disturbance (Friday), and the main threat from that will be an increase in winds, and there’s some degree of moisture. But this isn’t over yet.”