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

The Aspen Acres Fire burns on Friday in Rye, Colo. Michael Ciaglo/Getty Images hide caption

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.

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Authorities have ordered people to evacuate or to prepare to evacuate across counties including Custer, Pueblo, Huerfano and Fremont.

Scattered showers and thunderstorms could hit south central and southwest Colorado on Sunday, according to the National Weather Service .

Officials and forecasters say the rain could be beneficial for firefighting but are concerned it could lead to road damage in burned areas and cause flash flooding.

"The main threats from storms will be gusty outflow winds up to 50 mph and lightning," the NWS office in Pueblo said .

Red flag warnings and air quality alerts have also been issued across the state, with the Colorado Department of Public Health and Environment on Sunday warning residents to limit time outdoors because of heavy smoke.

Other wildfires are burning in the state, including the Ferris Fire in southwest Colorado that has grown to more than 42,000 acres and is 7% contained as of Sunday afternoon. The Gold Mountain Fire, which is also in the southwest portion of the state, has grown to more than 25,000 acres and is 0% contained as of Sunday.

A memorial service was held on Sunday for three firefighters who were killed battling wildfires on the Colorado-Utah border on June 27: Emily Barker, Sydney Watson and Nick Hutcherson.

The firefighters, along with two others, were involved in a "burnover incident," which happens when firefighters are overtaken and have to shelter as best they can while a fire passes directly over them, according to the Department of Interior. Two firefighters survived and were treated for burns.

Colorado Gov. Jared Polis ordered flags to fly half-staff in honor of the deceased firefighters.

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"These three brave heroes ran towards the flames, put themselves in harm's way, and gave the ultimate sacrifice to protect Coloradans, our communities and our families," Polis said in a social media post on Sunday.

Another fire across the border in southern Utah, the Babylon Fire, has grown to more than 90,000 acres and is O% contained as of Sunday afternoon. It is expected to be hot and dry through Monday, with very little humidity, officials said, making conditions challenging for containment.