Thunderstorms, heat and wind will hamper efforts to contain Colorado wildfires

Michael Ciaglo/Getty Images

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Michael Ciaglo/Getty Images

Thunderstorms with high winds on Sunday could hamper efforts to contain a massive wildfire that has scorched parts of southern Colorado.

The Aspen Acres Fire, which is burning south of Colorado Springs across Pueblo and Custer counties, has grown to more than 86,000 acres. It began nearly a week ago and is 13% contained, officials said on Sunday morning.