Calmer winds could help slow the spread of a wildfire that started on a military training site in southeastern Colorado.
The fire is now estimated to be burning on 42,000 acres, fanned by two straight days of strong winds.
It jumped the Purgatoire River, a natural fire break, and is now burning in surrounding federal, state and private land.
Officials with the Rocky Mountain Fire Department say there are eight residences threatened as well as numerous historic and prehistoric sites. They say the area is rich with rock art and artifacts from the waves of settlers who've called the area home for centuries.
Fort Carson officials say they are defending some training structures on their property but they are only aware of one structure being threatened off post.
Temperatures are expected to reach the high 70s with winds of up to 10 miles per hour on Friday. Steve Segin of the Rocky Mountain Area Coordination Center said the break in the weather should help firefighters go on the offense against the fire.