In this Saturday, June 23, 2012 photo provided by Darrell Spangler, a firefighter works the scene of a home being consumed by flames in Estes Park, Colo. As many as 21 structures were destroyed by the fire on Saturday. Eight separate wildfires are burning across Colorado, which is seeing record-breaking heat. (AP Photo/Darrell Spangler) MANDATORY CREDIT
In this Saturday, June 23, 2012 photo provided by Darrell Spangler, a firefighter works the scene of a home being consumed by flames in Estes Park, Colo. As many as 21 structures were destroyed by the fire on Saturday. Eight separate wildfires are burning across Colorado, which is seeing record-breaking heat. (AP Photo/Darrell Spangler) MANDATORY CREDIT
In this Saturday, June 23, 2012 photo provided by Darrell Spangler, fire consumes a home in Estes Park, Colo. As many as 21 structures were destroyed by the fire on Saturday. Eight separate wildfires are burning across Colorado, which is seeing record-breaking heat. (AP Photo/Darrell Spangler) MANDATORY CREDIT
Bill Hahnenberg, incident commander for the High Park Fire, appears during an interview on his last day in charge of firefighting operations, Sunday, June 24, 2012, at the Fort Collins Armory in Fort Collins, Colo. A new incident command team takes over on Monday, June 25. With eight wildfires burning, including a fire that has scorched more than 118 square miles and destroyed at least 191 homes near Fort Collins, Colorado is having its worst wildfire season in a decade. (AP Photo/The Coloradoan, Dawn Madura) NO SALES
Ken and Dottie Wanberg inspect a map as they try to gather news of their second home, which is located inside an evacuated area in the Glacier View subdivision, on Sunday, June 24, 2012, outside The Forks in Livermore, Colo. With eight wildfires burning, including a fire that has scorched more than 118 square miles and destroyed at least 191 homes near Fort Collins, Colorado is having its worst wildfire season in a decade. (AP Photo/The Coloradoan, Dawn Madura) NO SALES
Smoke rises from the High Park Fire on Sunday, June 24, 2012, near Livermore, Colo. With eight wildfires burning, including a fire that has scorched more than 118 square miles and destroyed at least 191 homes near Fort Collins, Colorado is having its worst wildfire season in a decade. (AP Photo/The Coloradoan, Dawn Madura) NO SALES
MANITOU SPRINGS, Colo. (AP) ? Searing, record-setting heat in the interior West didn't loosen its grip on firefighters struggling to contain blazes in Colorado, Utah and other Rocky Mountain states.
Colorado has endured nearly a week of 100-plus degree days and low humidity, sapping moisture from timber and grass, creating a devastating formula for volatile wildfires across the state and punishing conditions for firefighters.
"When it's that hot, it just dries the fuels even more. That can make the fuels explosive," said Steve Segin, a fire spokesman for the U.S. Forest Service.
Much of Nevada, Utah, Wyoming and Colorado are under a red flag warning, meaning conditions are hot, dry and ripe for fires.
For the fourth straight day, Denver cleared 100 degrees and reached a record high temperature of 105 Monday. Other areas in the state have also been topping 100 degrees, including northern Colorado where the state's second largest wildfire in history is burning.
And the scorching heat doesn't appear to be letting up soon. Temperatures across Colorado are expected to clear 100 degrees again on Tuesday. Segin said such prolonged heat is "extremely taxing" physically on firefighters, who are working long days and carrying heavy gear.
The wildfires are also posing a threat to tourism.
Several large wildfires across the West have placed some tourist destinations from Montana to New Mexico in danger just at the height of midsummer family road-trip season, putting cherished Western landscapes at risk along with hordes of vacationers.
In Colorado, the $5 billion tourism industry is on edge as images of smoke-choked Pikes Peak and flaming vacation cabins near Rocky Mountain National Park threaten to scare away summer tourists.
In central Utah, a wildfire in an area dotted with vacation cabins was burning an estimated 58 square miles and threatening about 300 homes. Firefighters had that blaze at 10 percent containment Monday. The Sanpete County Sheriff's office said that as many as 30 structures may have been lost.
And in New Mexico, firefighters Monday were mopping up a small wildfire that threatened one of that state's top tourist attractions, El Santuario de Chimayo, a 19th century church north of Santa Fe. The church draws some 300,000 visitors a year and appeared to be out of danger Monday.
With the nation's privately owned fleet of heavy air tankers already in use or unavailable, U.S. Forest Chief Tom Tidwell said his agency had to call on C-130 military tankers to help. The order came as new fires started in Colorado, Utah, Alaska and Arkansas. In all, more than 1.3 million acres across the U.S. have been charred this year.
Tidwell told The Associated Press in a phone interview Monday that about half of the nation's personnel who are usually assigned to large fires are working in Colorado right now.
"It's just because it's so dry," Tidwell said. "Not unlike New Mexico ? they saw very low snowpack, especially in that lower country. Hot, dry winds with dry fuels, you get the ignition, and this is what we see."
Even as some evacuated residents in Colorado were allowed to return home, tourists streamed out of some of Colorado's most popular summer sights.
"They don't want to come back where it is smoky and uncomfortable, so they move on," said Chris Champlin, operator of the Pikes Peak RV Park, which is usually packed ahead of the July 4 holiday.
The fire that emptied Champlin's RV park burned out of control at more than 5 square miles Monday, with smoke at times obscuring Pikes Peak.
In Manitou Springs, a tourist town at the base of Pikes Peak, the Blue Skies Inn was back open for business Monday, a day after guests were roused and told to evacuate. But manager Mike Dutcher worried that officials pleading for firefighting help could spook visitors.
"Tourism is a big business in Colorado, and if you hyperventilate when CNN shows up, it hurts a lot of people," Dutcher said.
The head of the state's tourism office said it's too soon to know how the fires will affect the number of summer tourists. But Al White, director of the Colorado Tourism Office, insisted, "The active fires represent a very, very small piece of Colorado."
Colorado is having its worst fire season since the drought-stricken year of 2002. In June of that year, wildfires charring tens of thousands of acres near the resort towns of Glenwood Springs and Durango and in Pike National Forest near Denver prompted then-Gov. Bill Owens to proclaim that it looked as if "all of Colorado is burning today."
In northern Colorado, authorities announced that the High Park Fire had destroyed 248 homes, up from 191. That fire has killed one woman and scorched more than 130 square miles and was just 55 percent contained Monday. It's the second largest wildfire in state history.
Elsewhere across the West:
? An Alaska wildfire between Mount McKinley and town of Anderson grew to more than 30 square miles Monday. No homes were threatened.
? Despite dry, hot conditions, firefighters battling a fire that consumed nearly 70 square miles west of Ruidoso, N.M., was 90 percent contained, with many residents allowed to return home.
? A wildfire in Tonto National Forest near Young, Ariz., was 65 percent contained Monday as winds slowed to about 3 mph.
? Authorities in southwestern Montana ordered residential evacuations in a small community threatened by one of two wildfires. The blazes were burning in the Beaverhead-Deerlodge National Forest.
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Associated Press writers Susan Montoya Bryan in Albuquerque, N.M., Rema Rahman and Kristen Wyatt in Denver and Michelle Rindels in Las Vegas contributed to this report.
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