A Colorado prison was evacuated as one of the largest wildfires in state history continued to grow, and officials warned residents of remote areas to be ready to leave Sunday as gusty winds and low humidity fed the flames.

One of the fires burning now more than 100,000 acres in Rio Blanco County in northwest Colorado continues to grow during ongoing "near-critical fire weather" conditions.

In western Colorado, firefighters are up against windy, hot weather as they try to protect homes and infrastructure from a pair of lightning-caused wildfires.