This photo provided by the Oregon Department of Forestry shows a firefighting tanker making a retardant drop over the Grandview Fire near Sisters, Ore., Sunday, July 11, 2021. The wildfire doubled in size to 6.2 square miles (16 square kilometers) Monday, forcing evacuations in the area, while the state's biggest fire continued to burn out of control, with containment not expected until November. Credit: Oregon Department of Forestry via AP

An army of firefighters labored in hot, dry and windy weather Tuesday to contain fires chewing through wilderness and burning homes across drought-stricken Western states already sweltering in the second heat wave of the year.

A that created the intense weather was weakening, but temperatures were forecast to remain above normal on the lines of more than 60 active large blazes burning in the West and Alaska.

More than 14,000 firefighters and support personnel were attacking fires covering close to a million acres (1,562 miles, 4,047 square kilometers) of land, according to the National Interagency Fire Center.

The largest fire in the United States was incinerating huge swaths of the Fremont-Winema National Forest in southern Oregon, where firefighters received a warning about conditions from incident commander Al Lawson.

"As you go out there today—adjust your reality," he said. "We have not seen a fire move like this, in these conditions, this early in the year. Expect the fire to do things that you have not seen before."

The week-old Bootleg Fire had ravaged about 316 square miles (818 square kilometers) by Tuesday morning, threatening about 2,000 homes and destroying more than 20 others, along with other minor structures. The fire's movement prompted authorities to place additional areas under evacuation notice and expand the number of acres ordered closed on an emergency basis inside Fremont-Winema.

Wildland firefighters watch and take video with their cellphones as a plane drops fire retardant on Harlow Ridge above the Lick Creek Fire, southwest of Asotin, Wash., Monday, July 12, 2021. The fire, which started last Wednesday, has now burned over 50,000 acres of land between Asotin County and Garfield County in southeast Washington state. Credit: Pete Caster/Lewiston Tribune via AP

Scientists say climate change has made the West much warmer and drier, and they warn that weather will get wilder as the world warms. They say extreme conditions are often from a combination of unusually random, short-term and natural weather patterns heightened by long-term, human-caused climate change. However, special studies are needed to determine how much global warming is to blame, if at all, for a single extreme weather event.

Firefighters have had some success in keeping the Bootleg Fire out of several .

"Quick actions from crews on the ground prevented numerous homes from catching fire during nighttime ember showers," a U.S. Forest Service statement said Monday.

The fire disrupted three transmission lines that provide electricity to California and the state's power grid operator asked for voluntary power conservation Monday. The California Independent System Operator said Tuesday that the grid was stable and with the forecast for cooler temperatures another call for conservation was not expected.

This photo provided by the Oregon Department of Forestry shows active fire along a ridge at the Grandview Fire near Sisters, Ore., Sunday, July 11, 2021. The wildfire doubled in size to 6.2 square miles (16 square kilometers) Monday, forcing evacuations in the area, while the state's biggest fire continued to burn out of control, with containment not expected until November. Credit: Oregon Department of Forestry via AP

In northeastern California, progress was reported on the state's largest fire so far this year. The Beckwourth Complex, a combined pair of lighting-ignited blazes, was almost 50% contained after blackening more than 145 square miles (375 square kilometers) near the Nevada state line.

Damage was still being tallied in the rural community of Doyle, California, where flames swept in during the weekend and destroyed several homes, including Beverly Houdyshell's.

The 79-year-old said Tuesday that she's too old and too poor to rebuild and isn't sure what her future holds.

"What chance do I have to build another house, to have another home?" Houdyshell said. "No chance at all."

Doyle remained under evacuation orders but other areas were on warning status, meaning residents were told to be ready to leave if necessary.

  • Shane Durant watches the Bootleg Fire smoke plume while walking his dog, Monday, July 12, 2021, near Bly, Ore. Credit: AP Photo/Nathan Howard

  • Plumes of smoke from the Bootleg Fire rise over a playground, Monday, July 12, 2021, near Bly, Ore. Credit: AP Photo/Nathan Howard

  • Shane Durant watches the Bootleg Fire smoke plume while walking his dog, Monday, July 12, 2021, near Bly, Ore. Credit: AP Photo/Nathan Howard

  • A Klamath County Sheriff's vehicle drives toward smoke from the Bootleg Fire, Monday, July 12, 2021, near Klamath Falls, Ore. Credit: AP Photo/Nathan Howard

  • The Bootleg Fire smoke plume rises over power lines, Monday, July 12, 2021, near Klamath Falls, Ore. Credit: AP Photo/Nathan Howard

  • A firefighting helicopter lands at a fire staging area near the Bootleg Fire, Monday, July 12, 2021, in Chiloquin, Ore. Credit: AP Photo/Nathan Howard

  • After lighting a fire line to burn up fuel for the Lick Creek Fire, a crew of wildland firefighters begin to put out the flames, Monday, July 12, 2021, south of Asotin, Wash. Credit: Pete Caster/Lewiston Tribune via AP

  • A sign thanking firefighters and first responders hangs near the Bootleg Fire, Monday, July 12, 2021, in Chiloquin, Ore. Credit: AP Photo/Nathan Howard

  • Wildland firefighters spray water onto a tree that caught fire as they were building a fire line for the Lick Creek Fire, Monday, July 12, 2021, south of Asotin, Wash. Credit: Pete Caster/Lewiston Tribune via AP

  • A scoop plane drops water onto a burning ridge where a fire line had been created by crews of wildland firefighters, Monday, July 12, 2021, at the Lick Creek Fire, south of Asotin, Wash. Credit: Pete Caster/Lewiston Tribune via AP

  • A wildland fire crew looks on after setting a fire line on Harlow Ridge above the Lick Creek Fire, Monday, July 12, 2021, south of Asotin, Wash. Credit: Pete Caster/Lewiston Tribune via AP

A fire that began Sunday in the Sierra Nevada south of Yosemite National Park grew to nearly 15 square miles (39 square kilometers) but containment increased to 15%. Four unspecified buildings were destroyed.

Elsewhere, several wildfires burned in north-central Washington state, prompting an evacuation order for the town of Nespelem and surrounding areas. The Northwest Interagency Coordination Center said about 60 lightning strikes were reported Monday on or near the town, sparking five wildfires. The largest had burned approximately 15.6 square miles (40 square kilometers) in grass, sagebrush and timber and had zero containment.

A 9-mile (14.5-kilometer) stretch of Interstate 15 across the corner of northwestern Arizona reopened to traffic Tuesday after a 5 1/2-hour overnight closure due to a brush .