In the Rocky Mountain West, firefighters say they've never seen the trees and grasses this dry so early in the summer.

"It's epic dryness," says Beth Lund, leader of the incident management team assigned to the High Park Fire, which has burned 135 square miles near Fort Collins, Colo., and destroyed at least 257 homes. It is now the most destructive in recorded Colorado history.

But hardly the only one. Ten separate fires are burning in Colorado, prompting a planned visit Friday by President Obama. They threaten the U.S. Air Force Academy, the town of Boulder and the city of Colorado Springs.

Colorado isn't the only state affected by an exceptionally severe fire season, with crews battling blazes in Alaska, Arizona, California, Montana, Nevada, New Mexico, Utah and Wyoming.

"The whole Central Rocky Mountain range is a tinderbox," says Ron Roth, of the Rocky Mountain Area Coordinating Center in Lakewood, Colo.

A light winter snow pack, dry spring, more people living in what was once wilderness and the long-term effects of climate change have all conspired to make this an especially bad fire season, Roth says. "We've got trees torching, tornadoes of fire -- this is extreme fire behavior," he says.

The exceptional danger is a combination of very dry vegetation and waves of lightning storms, says Lee Bently, a public information officer for the incident management team responsible for the High Park Fire. "It's just instant ignition."

SOURCE: USA Today

Elizabeth Weise and Trevor Hughes