QUINCY, Calif. (AP) — Thousands of Northern California homes remain threatened by the nation’s largest wildfire and officials warn the danger of new blazes erupting across the West is high because of unstable weather.

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Thunderstorms haven't produced much rain, but whipped up winds and generated lightning strikes across the northern Sierra where crews were battling the month-old Dixie Fire.

Extreme heat returned Sunday, with temperatures expected to top 100 degrees.

More than 100 large wildfires were burning in more than a dozen states in the West, a region seared by drought and hot, bone-dry weather that turned forests, brushlands, meadows and pastures into tinder.

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