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A wildfire in south-central Colorado has grown to nearly 1,600 acres, but containment is increasing.

A wildfire in south-central Colorado has grown to nearly 1,600 acres, but containment is increasing.

BILLINGS, Mont. - With numerous fires currently burning thousands of acres across the state, Yellowstone County Emergency Services Director K.C. Williams explains the three factors that can impact a fire's behavior. How a fire behaves is a combination of fuel, weather and topography. Williams says different fuel types cause fire to behave differently. "Finer fuels that are smaller burn faster. Heavier fuels such as logs, burn a little bit slower, but both are capable of burning very intensely based on how much resin is in some of the fuel package, how dry it is," says Williams. Weather can ha...

>> about 6 miles down the road, south from where the community is situated, crews from u.s. forest service were working the hot spots. >> right here we had a hazard tree, an oak tree that was leaning up in to some other trees that were creating overhead hazards for firefighters and the public. >> the big concern on the fire line today, the wind. they picked up, and that of course makes the fire extremely unpredictable. >> this fire is coming back to life now that the weather's changed. >> fire behavior analyst says they haven't seen smoke for a few days since the rain and snow helped knock the...

He thought she might remember key details. >> bring her up there as a witness and have her reenact her actions on the day of the fire. her story is she smelled smoke. >> she drove up on the fire and saw it and parked her vehicle. >> and found the campfire burning at 20 x 20 feet. >> reporter: if you look there among the trees, you can see them timing barton's every step. and in their reconstruction, they stumbled across something they couldn't explain. >> the story just did not make sense within the fire behavior context. >> reporter: remember, barton said she was first drawn to the fire by it...