Massive fire still burning in Yosemite

A fire truck drives past burning trees as firefighters continue to battle the Rim Fire near Yosemite National Park, Aug. 26, 2013.

The largest of dozens of western wildfires, the Rim Fire has already burned through 15,000 acres of land in Yosemite alone, and is threatening 4,500 nearby buildings Monday morning, including homes, vacation cabins and businesses.

Read more: Massive wildfire in Yosemite area challenges firefighters

Two firefighters watch trees burn while battling the Rim Fire near Yosemite National Park, Calif., Aug. 26, 2013.

Flames from the Rim Fire consume trees near Groveland, Calif., Aug. 25, 2013.

U.S. Fish and Wildlife Service firefighter Corey Adams sits on a tree stump as he monitors the Rim Fire near Groveland, Calif., Aug. 25, 2013.

Trees burned by the Rim Fire stand in Yosemite National Park, Calif., Aug. 25, 2013.

The Rim Fire consumes trees near Groveland, Aug. 24, 2013.

Smoke from the Rim Fire fills the sky near Groveland, Aug. 24, 2013.

Smoke rises from smoldering trees as firefighters continue to battle the Rim Fire near Yosemite National Park, Aug. 25, 2013.

U.S. Fish and Wildlife Service firefighter Corey Adams sits on a tree stump as he monitors the Rim Fire near Groveland, Aug. 25, 2013.

Flames billow from the front of a car that was consumed by the Rim Fire near Groveland, Aug. 25, 2013.

A member of the West Stanislaus County Fire Department monitors the Rim Fire along highway 120 near Groveland, Aug. 24, 2013.

A firefighting helicopter prepares to drop water on the Rim Fire near Groveland, Aug. 24, 2013.

Cows walk through a section of forest that was burned by the Rim Fire outside of Camp Mather near Groveland, Aug. 24, 2013.

Trees burned by the Rim Fire stand outside of Camp Mather near Groveland, Aug. 24, 2013.

A member of the West Stanislaus County Fire Department monitors the Rim Fire along highway 120 near Groveland, Aug. 24, 2013.

Firefighters move away from a burning manzanita bush as they battle the Rim Fire in Yosemite National Park, Aug. 24, 2013.

A firefighter uses a hose to douse the flames of the Rim Fire near Groveland, Aug. 24, 2013.

A bear and cub cross a road near the Rim Fire in Yosemite National Park, Aug. 24, 2013.

Firefighters monitor a spot fire while battling the Rim Fire in Yosemite National Park, Aug. 24, 2013.

A Murphys Fire District firefighter stops his vehicle as a massive wall of fire from the Rim Fire consumes trees along highway 120 near Groveland, Aug. 24, 2013.

U.S. Forest Service firefighter Chris Brossard monitors a spot fire while battling the Rim Fire in Yosemite National Park, Aug. 24, 2013.

A Caltrans worker operates a pile driver as he replaces guard rail posts that were burned by the Rim Fire along U.S. Highway 120, Aug. 24, 2013.

A firefighter walks through smoke while battling the Rim Fire in Yosemite National Park, Aug. 24, 2013.

Smoke from the Rim Fire lingers over the O'Shaughnessy Dam at Hetch Hetchy Reservoir in Yosemite National Park, Aug. 24, 2013.

The Rim Fire consumes trees near Groveland, Aug. 24, 2013.

A member of the Kern County Rio Bravo Hot Shots monitors the Rim Fire near Groveland, Aug. 24, 2013.

Firefighters use a hose to douse the flames of the Rim Fire near Groveland, Aug. 24, 2013.

A California Department of Forestry helicopter drops water on the Rim Fire in Groveland, Aug. 24, 2013.

A Murphys Fire District firefighter stops his vehicle as a massive wall of fire from the Rim Fire consumes trees along highway 120 near Groveland, Aug. 24, 2013.

The Rim Fire erupts as it approaches Yosemite Lake on August 23, 2013.

A firefighter uses a hose to mop up hot spots from the Rim Fire in Yosemite National Park, Aug. 23, 2013.

A Tuolumne County firefighter mops up hot spots from a back fire while battling the Rim Fire at Camp Mather near Groveland, Aug. 23, 2013.

Trees burned by the Rim Fire are seen at Camp Mather near Groveland, Aug. 23, 2013.

Smoke from the Rim Fire hovers over a ridge with burned trees near Groveland, Calif., Aug. 23, 2013.

A coyote walks across U.S. Highway 120, shut down due to the Rim Fire, near Groveland, Aug. 23, 2013.

An air tanker drops fire retardant on a ridge ahead of the advancing Rim Fire in Groveland, Aug. 22, 2013.

Firefighters monitor the Rim Fire in Groveland, Aug. 22, 2013.

Fire consumes trees along U.S. highway 120 as the Rim Fire burns out of control in Buck Meadows, Calif., Aug.21, 2013.