Oregon blaze latest major wildfire to engulf US West

Dozens of active infernos in California, Idaho, Oregon, Washington and other western states have ravaged more than 1,200 square miles (3,100 square kilometers), worsening air quality and highlighting the devastating effects of a historic two-decade-plus drought that has left the region parched.

The Cedar Creek fire east of the city of Eugene, Oregon experienced "extreme" growth over the weekend and has now consumed 86,734 acres (35,100 hectares) -- roughly twice the size of the US capital Washington -- with zero percent containment as of Monday, according to the National Wildfire Coordinating Group (NWCG).

More than 1,200 firefighters and other personnel have converged on the steep mountainous terrain, much of it in US national forest land and hard to reach.

"They have been constructing firelines away from the active fire edge, along roads and trails, where they have a better chance of successfully stopping the fire," NWCG reported.

Evacuations were ordered for Lane and Deschutes counties, and the Deschutes and Willamette national forests have been closed. More than 2,000 homes were under threat, authorities said.

Dense smoke has enveloped the region, and according to NWCG, "smoke has created unhealthy air quality for communities east of the fire as well, including Bend," a town that serves as a gateway for outdoor tourism.

"Get out of here as fast as I can," Herman Schimmel, who moved to the small town of Westfir only recently, told The Oregonian newspaper. "That's all I was thinking about."

Local media reported that cooler and calmer weather had improved conditions somewhat later on Monday, with officials easing evacuation instructions in some areas.

The western United States is more than two decades into a historic drought that scientists say is being worsened by human-made climate change.

Much of the countryside is parched, creating conditions for hot, fast and destructive wildfires.