FORT COLLINS, Colo. -- Crews on Saturday battled a fast-moving wildfire in northern Colorado that has scorched about 8,000 acres and prompted several dozen evacuation orders.

Larimer County Sheriff's Office spokesman John Schulz said the fire was reported just before 6 a.m. Saturday in the mountainous Paradise Park area about 25 miles northwest of Fort Collins.

The blaze expanded rapidly during the late afternoon and evening and by Saturday night, residents living along several roads in the region had been ordered to evacuate and many more were warned that they might have to flee. An evacuation center has been set up at a Laporte middle school.

Officials didn't specify how many residents had evacuated but said they had sent out 800 emergency notifications alerting people to the fire and the possibility that might have to flee.

"Right now we're just trying to get these evacuations done and get people safe," Schulz told Denver-based KMGH-TV, adding that "given the extreme heat in the area, it makes it a difficult time for (the firefighters)." Temperatures near Fort Collins reached the mid-80s Saturday afternoon with a humidity level of between 5 percent and 10 percent.

Ten structures have been damaged, although authorities were unsure if they were homes or some other kind of buildings. No injuries have been reported. The cause of the fire was unknown.

Aerial footage from KMGH-TV showed flames coming dangerously close to what appeared to be several outbuildings and at least one home in the area, as well as consuming trees and sending a large plume of smoke into the air.

Two heavy air tankers, five single-engine air tankers and four helicopters were on the scene to help fight the blaze, which appeared to be burning on private and U.S. Forest Service land and was being fueled by sustained winds of between 20 and 25 mph.

"It was just good conditions to grow," National Weather Service meteorologist Chad Gimmestad told The Associated Press. "The conditions today were really favorable for it to take off."

He said firefighters should benefit from cooler weather this evening, but the cold front also is expected to bring wind gusts as high as 40 mph.

"It's a trade off," he said. "The biggest thing might be that it will be pushing (the fire) in a different direction and the way this is playing out, it might be in the direction of homes."

Also Saturday, KMGH reported a grass fire destroyed at least four outbuildings near Interstate 25 and Colorado 7 in Erie. Images from the station's helicopter showed at least one car engulfed in flames.

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  • A birdfeeder hangs in front of a home d

    A birdfeeder hangs in front of a home destroyed by the High Park Fire, in Bellvue, Colorado west of Fort Collins June 30, 2012. The High Park Fire burned more than 87,000 acres and left one person dead and destroyed 259 homes making it the second-largest and second-most destructive fire in Colorado state history. The High Park Fire is 97 percent contained while the Waldo Canyon Fire, which has burned more than 17,000 acres, left at least two people dead and destroyed 346 homes is 45 percent contained. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Maggie Baker looks over item retrieved f

    Maggie Baker looks over item retrieved from her brother-in-law's home which was burnt to the ground in the High Park Fire, June 30, 2012 in Bellvue, Colorado west of Fort Collins. The inferno burned more than 87,000 acres and left one person dead and destroyed 259 homes. The High Park Fire, which started June 9 from a lightning spark, is the second-largest and second-most destructive fire in Colorado state history. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Maggie Baker (R) and her sister-in-law N

    Maggie Baker (R) and her sister-in-law Nellie Bowman walk through the remains of her brother-in-law's home which was burnt to the ground in the High Park Fire, June 30, 2012 in Bellvue, Colorado west of Fort Collins. The inferno burned more than 87,000 acres and left one person dead and destroyed 259 homes. The High Park Fire, which started June 9 from a lightning spark, is the second-largest and second-most destructive fire in Colorado state history. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Maggie Baker (R) and her sister-in-law N

    Maggie Baker (R) and her sister-in-law Nellie Bowman walk through the remains of her brother-in-law's home which was burnt to the ground in the High Park Fire, June 30, 2012 in Bellvue, Colorado west of Fort Collins. The inferno burned more than 87,000 acres and left one person dead and destroyed 259 homes. The High Park Fire, which started June 9 from a lightning spark, is the second-largest and second-most destructive fire in Colorado state history. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Maggie Baker looks at items retrieved fr

    Maggie Baker looks at items retrieved from the remains of her brother-in-law's home which was burnt to the ground in the High Park Fire, June 30, 2012 in Bellvue, Colorado west of Fort Collins. The inferno burned more than 87,000 acres and left one person dead and destroyed 259 homes. The High Park Fire, which started June 9 from a lightning spark, is the second-largest and second-most destructive fire in Colorado state history. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Maggie Baker visits the remains of her b

    Maggie Baker visits the remains of her brother-in-law's home which was burnt to the ground in the High Park Fire, June 30, 2012 in Bellvue, Colorado west of Fort Collins. The inferno burned more than 87,000 acres and left one person dead and destroyed 259 homes. The High Park Fire, which started June 9 from a lightning spark, is the second-largest and second-most destructive fire in Colorado state history. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Frank Baker visits the remains of his br

    Frank Baker visits the remains of his brother's home which was burnt to the ground in the High Park Fire, June 30, 2012 in Bellvue, Colorado west of Fort Collins. The inferno burned more than 87,000 acres and left one person dead and destroyed 259 homes. The High Park Fire, which started June 9 from a lightning spark, is the second-largest and second-most destructive fire in Colorado state history. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • A charred animal trailer sits amidst the

    A charred animal trailer sits amidst the destruction caused by the High Park Fire, in Bellvue, Colorado west of Fort Collins June 30, 2012. The High Park Fire burned more than 87,000 acres and left one person dead and destroyed 259 homes making it the second-largest and second-most destructive fire in Colorado state history. The High Park Fire is 97 percent contained while the Waldo Canyon Fire, which has burned more than 17,000 acres, left at least two people dead and destroyed 346 homes is 45 percent contained. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • A fireplace is all that remains of a hom

    A fireplace is all that remains of a home burnt to the ground in the High Park Fire, in Bellvue, Colorado west of Fort Collins June 30, 2012. The High Park Fire burned more than 87,000 acres and left one person dead and destroyed 259 homes making it the second-largest and second-most destructive fire in Colorado state history. The High Park Fire is 97 percent contained while the Waldo Canyon Fire, which has burned more than 17,000 acres, left at least two people dead and destroyed 346 homes is 45 percent contained. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • A scorched pathway leading to a home des

    A scorched pathway leading to a home destroyed by the High Park Fire, is seen June 30, 2012 in Bellvue, Colorado west of Fort Collins. The High Park Fire burned more than 87,000 acres and left one person dead and destroyed 259 homes making it the second-largest and second-most destructive fire in Colorado state history. The High Park Fire is 97 percent contained while the Waldo Canyon Fire, which has burned more than 17,000 acres, left at least two people dead and destroyed 346 homes is 45 percent contained. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • An item recovered from a home destroyed

    An item recovered from a home destroyed in the High Park Fire, June 30, 2012 in Bellvue, Colorado west of Fort Collins. The inferno burned more than 87,000 acres and left one person dead and destroyed 259 homes making it the second-largest and second-most destructive fire in Colorado state history. The High Park Fire is 97 percent contained while the Waldo Canyon Fire, which has burned more than 17,000 acres, left at least two people dead and destroyed 346 homes is 45 percent contained. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • A home surrounded by burnt land stands u

    A home surrounded by burnt land stands undamaged after the High Park Fire, in Bellvue, Colorado west of Fort Collins June 30, 2012. The High Park Fire burned more than 87,000 acres and left one person dead and destroyed 259 homes making it the second-largest and second-most destructive fire in Colorado state history. The High Park Fire is 97 percent contained while the Waldo Canyon Fire, which has burned more than 17,000 acres, left at least two people dead and destroyed 346 homes is 45 percent contained. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)

  • Dragons Eye

    <a href="http://www.huffingtonpost.com/social/kcr56rck"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/kcr56rck">kcr56rck</a>:<br />Eye Of The Dragon (High Park Fire from Fort Collins Colorado)

  • High Park Wildfire

    Fire burns behind homes north of Poudre Canyon in the Glacier View area near Livermore, Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • High Park Wildfire

  • High Park Wildfire

    Fire burns behind homes north of Poudre Canyon in the Glacier View area near Livermore, Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • High Park Wildfire

    A slurry bomber drops retardant on the High Park wildfire after it crossed to the north side of Poudre Canyon and threatened homes in the Glacier View area near Livermore , Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • High Park Wildfire

    The sun sets behind a plume of smoke from the High Park wildfire near Livermore , Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • Image via <a href="http://www.facebook.com/photo.php?fbid=10151219758154638&set=p.10151219758154638&type=1&theater" target="_hplink">Facebook</a>.

  • Image via <a href="http://www.facebook.com/photo.php?fbid=3273738644328&set=p.3273738644328&type=1&theater" target="_hplink">Facebook</a>.

  • High Park Wildfire

    A firefighting helicopter races to dump a load of water on the fire north of Poudre Canyon in the Glacier View area near Livermore, Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Shirley Paskett, left, and her partner Pam Creech react as they listen to a reverse 911 call telling them to evacuate their home after the High Park wildfire crossed to the north side of Poudre Canyon in the Glacier View area near Livermore, Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Shirley Paskett loads her stuffed bob cat into her vehicle after she and her partner were evacuated from their home after the High Park wildfire crossed to the north side of Poudre Canyon the Glacier View area near Livermore, Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    A firefighting aircraft is dwarfed by a plume of smoke north of Poudre Canyon in the Glacier View area near Livermore, Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Fire burns behind homes north of Poudre Canyon in the Glacier View area near Livermore, Colo., on Friday, June 22, 2012. The fire is burning on more than 68,000 acres west of Fort Collins and has destroyed at least 189 homes (AP Photo/Ed Andrieski)

  • In this June 19, 2012 photo provided by the Colorado National Guard, an aircraft drops a load of fire retardant slurry above the High Park wildfire about 15 miles west of Fort Collins, Colo. The ammonium phosphate dropped from airplanes to slow the spread of raging wildfires can turn a pristine mountain stream into a death zone for trout and some say the retardant has never been proven effective. (AP Photo/Colorado National Guard, John Rohrer)

  • In a photo made on Tuesday, June 19, 2012, and made available on Wednesday by the Colorado National Guard, firefighters from the Monument, Colo., fire department march to dinner at sunset in a base camp near the High Park wildfire about 15 miles west of Fort Collins, Colo.(AP Photo/Colorado National Guard, John Rohrer)

  • In this June 19, 2012 photo provided by the Colorado National Guard, an aircraft drops a load of fire retardant slurry above the High Park wildfire about 15 miles west of Fort Collins, Colo. The ammonium phosphate dropped from airplanes to slow the spread of raging wildfires can turn a pristine mountain stream into a death zone for trout and some say the retardant has never been proven effective. (AP Photo/Colorado National Guard, John Rohrer)

  • Burned trees stand on the south side of Poudre Canyon where the High Park wildfire devastated the west of Fort Collins, Colo., on Wednesday, June 20, 2012. The largest Colorado blaze west of Fort Collins was 55 percent contained and has destroyed at least 189 homes since it was sparked by lightning June 9. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    The stairs that led to a home that was destroyed by the High Park Wild fire are photographed during a tour by fire officials in Poudre Canyon west of Fort Collins, Colo., on Wednesday, June 20, 2012. The largest Colorado blaze west of Fort Collins was 55 percent contained and has destroyed at least 189 homes since it was sparked by lightning June 9. (AP Photo/Ed Andrieski)

  • The stairs that led to a home that was destroyed by the High Park Wild fire are photographed during a tour by fire officials in Poudre Canyon west of Fort Collins, Colo., on Wednesday, June 20, 2012. The largest Colorado blaze west of Fort Collins was 55 percent contained and has destroyed at least 189 homes since it was sparked by lightning June 9. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    A burnt cactus stands near a home that was destroyed by the High Park Wildfire are pictured during a tour by fire officials in Poudre Canyon west of Fort Collins, Colo., on Wednesday, June 20, 2012. Areas with other homes destroyed were not included in the tour. (AP Photo/Ed Andrieski)

  • Burned trees stand on the south side of Poudre Canyon where the High Park wildfire devastated the west of Fort Collins, Colo., on Wednesday, June 20, 2012. The largest Colorado blaze west of Fort Collins was 55 percent contained and has destroyed at least 189 homes since it was sparked by lightning June 9. (AP Photo/Ed Andrieski)

  • In this photo made on Monday, June 18, 2012, and made available Wednesday by the Colorado National Guard, a helicopter drops a load of water above the High Park wildfire, about 15 miles west of Fort Collins, Colo.. The fire already has destroyed at least 189 homes since it was sparked by lightning June 9. (AP Photo/Colorado National Guard, Jess Geffre)

  • In this photo made on Monday, June 18, 2012, and made available Wednesday by the Colorado National Guard, a helicopter drops a load of water above the High Park wildfire, about 15 miles west of Fort Collins, Colo. The fire already has destroyed at least 189 homes since it was sparked by lightning June 9. (AP Photo/Colorado National Guard , Jess Geffre)

  • In this photo taken on Monday, June 18, 2012, and made available Wednesday by the Colorado National Guard, a helicopter drops a load of water above the High Park wildfire, about 15 miles west of Fort Collins, Colo. The fire already has destroyed at least 189 homes since it was sparked by lightning June 9. (AP Photo/Colorado National Guard , Jess Geffre)

  • High Park Wildfire, Slurry Bomber

    A slurry bomber files through smoke as it circles to make a drop on the High Park wildfire near Livermore, Colo., on Tuesday, June 19, 2012. The fire already has destroyed at least 189 homes since it was sparked by lightning June 9. Incident commander Bill Hahnenberg said it could be weeks or even months before it's finally controlled. (AP Photo/Ed Andrieski)

  • High Park Wildfire

  • High Park Wildfire

    A spotter plane, top, catches up to a slurry bomber to lead it on a drop on the High Park wildfire near Livermore, Colo., on Tuesday, June 19, 2012. The fire already has destroyed at least 189 homes since it was sparked by lightning June 9. Incident commander Bill Hahnenberg said it could be weeks or even months before it's finally controlled. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Smoke rises beyond a pasture as the High Park wildfire continues to burn out of control near Livermore, Colo., on Tuesday, June 19, 2012. The fire already has destroyed at least 189 homes since it was sparked by lightning June 9. Incident commander Bill Hahnenberg said it could be weeks or even months before it's finally controlled. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Fire burns in the forest on the High Park wildfire near Livermore, Colo., on Tuesday, June 19, 2012. The wildfire has burned over 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    A helicopter lifts off after taking on water to drop on the High Park Fire west of Fort Collins, Colo., on Monday, June 18, 2012. The wildfire has now burned about 90 square miles and destroyed more than 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Smoke billows from the High Park Fire west of Fort Collins, Colo., on Monday, June 18, 2012. The wildfire has now burned about 90 square miles and destroyed more than 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    A helicopter lifts off after taking on water to drop on the High Park Fire west of Fort Collins, Colo., on Monday, June 18, 2012. The wildfire has now burned about 90 square miles and destroyed more than 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Smoke billows from the High Park Fire west of Fort Collins, Colo., on Monday, June 18, 2012. The wildfire has now burned about 90 square miles and destroyed more than 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Smoke billows from the High Park Fire west of Fort Collins, Colo., on Monday, June 18, 2012. The wildfire has now burned about 90 square miles and destroyed more than 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    The sun sets amidst smoke from the High Park Fire near Bellvue, Colo., on Monday, June 18, 2012. The wildfire has now burned about 90 square miles and destroyed more than 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Fire crowns in the trees on the High Park wildfire near Livermore, Colo., on Tuesday, June 19, 2012. The wildfire has burned over 180 homes. (AP Photo/Ed Andrieski)

  • High Park Wildfire

    Fire burns in the forest on the High Park wildfire near Livermore, Colo., on Tuesday, June 19, 2012. The wildfire has burned over 180 homes. (AP Photo/Ed Andrieski)

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