BELLVUE, Colo. - Firefighters are making progress on a 92-square-mile wildfire in northern Colorado that has destroyed more homes than any other in state history, but more residents were warned Tuesday to be ready to leave because of a spot fire that ignited near the main fire.

The large blaze west of Fort Collins was 50 percent contained after firefighters labored in temperatures in the 90s to extend lines around the fire Monday. Strong winds were expected but did not materialize; gusts of around 30 miles per hour, however, were forecast along with more hot, dry weather.