Lightning sparked two fires, the Castle Fire and the Shotgun Fire, which have merged to become the complex wildfire in the Sequoia and Inyo National Forests.
The fires are threatening about 800 structures, prompted evacuations for some Tulare County mountain communities.
Officials say hot, dry conditions and low humidity are contributing to fire activity.
A shifting wind pattern may be the biggest challenge for crews fighting the SQF Complex, which factored into the decision to expand evacuation orders over the weekend.
"These evacuations weren't done because the fire was knocking at the door of these communities," says Mark Vosbburgh. "But again, we don't want to be behind the curve on these evacuations. We want to be as proactive as we can."
SQF Complex Evacuation Orders:
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