Firefighters in Colorado are planning an evacuation zone along the Black Canyon of the Gunnison National Park's North Rim as part of their continuing efforts to bring the South Rim Fire under control.

Partial blue skies in the morning allowed many park visitors to ignore fires on the North Rim. By afternoon, ashfall made for a different story.

Here's what we know about the two wildfires that have destroyed tens of thousands of acres of forest and burned at least 70 structures.