The sun set on summer unofficially Monday night, and the response was an overnight light show early Tuesday from thousands of lightning strikes that filled the sky from from the Bay Area to the Central Valley.

The lightning came from increasingly unstable air and sparked a “number of fires,” the National Weather Service said. According to Cal Fire, none of those had grown into a major wildfire by 8 a.m. Tuesday.

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“Generally speaking, it’s tapering off,” NWS meteorologist Roger Gass said of the lightning early Tuesday. “But we can’t rule out some isolated thunderstorms later Tuesday around the East Bay.”

By 5:30 a.m. Tuesday, the weather service had recorded about 4,800 lightning strikes from Sacramento to San Luis Obispo, including 1,300 that touched the ground.

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