MIDDLETOWN,  CALIFORNIA:  Some 400 homes were among the hundreds of structures destroyed as fast-moving wildfires raged through communities in Northern California, leaving at least one person dead and sending residents fleeing along roads where some buildings and vehicles were still in flames.

The California Department of Forestry and Fire Protection confirmed Sunday one fatality in the wildfire north of San Francisco that raced through dry brush and exploded in size within hours. In addition to the homes, officials also counted two apartment complexes and 10 businesses destroyed by the flames, department spokeswoman Lynn Valentine said.

Valentine couldn't provide details on the circumstances of the death. A call to the Lake County Sheriff's office wasn't immediately returned.

In addition, up to 1,000 structures such as barns, sheds and other outbuildings were burned, said Cal Fire spokesman Daniel Berlant.

The devastation comes after a separate wildfire to the southeast destroyed at least 81 homes.

Residents fled from Middletown, dodging smoldering telephone poles, downed power lines and fallen trees as they drove through billowing smoke.

Teri Molini said she first heard word of the fire Saturday afternoon and raced out of her house with the family dog, blankets and mementos. Four hours later, she could see the flames from where she sought shelter.

"We said, 'OK, this thing's a beast," Molini, 53, said.

Whole blocks of houses were burned in parts of the town of more than 1,000 residents that lies about 20 miles north of the famed Napa Valley. On the west side of town, house after house was burned to their foundations, with only charred appliances and twisted metal garage doors still recognizable.

Firefighters on Sunday afternoon could be seen driving around flaming utility poles to put out spot fires. Homeowner Justin Galvin, 33, himself a firefighter, stood alone at his house, poking its shin-high, smoking ruins with a piece of scrap metal.

"This is my home. Or it was," said Galvin, who spent all night fighting another massive fire in the Sierra Nevada foothills.

Valentine said most of the destruction occurred in Middletown and Hidden Valley Lake, as well as numerous homes along a shuttered state highway.

Wind gusts that reached up to 30 mph sent embers raining down on homes and made it hard for firefighters to stop the Lake County blaze from advancing, Berlant said.

Four firefighters who are members of a helicopter crew suffered second-degree burns during the initial attack on the fire. They remained hospitalized in stable condition.

The fire continued to burn in all directions, triggering the evacuation of a stretch along Highway 281, including Clear Lake Riviera, a town with about 3,000 residents. It was threatening critical communications infrastructure as well as a power plant, Cal Fire said.

The 78-square-mile fire erupted Saturday afternoon and rapidly chewed through brush and trees parched from four years of drought. Entire towns as well as residents along a 35-mile stretch of State Route 29 were evacuated. Gov. Jerry Brown on Sunday declared a state of emergency to free up resources.

Brown had already declared a state of emergency for a separate 102-square-mile wildfire about 70 miles southeast of Sacramento that has destroyed at least 81 homes and turned the grassy, tree-studded Sierra Nevada foothills an eerie white.

The fire was 25 percent contained.

Mark Ghilarducci, director of the Governor's Office of Emergency Services, said this summer's fires are the most volatile he has seen in 30 years of emergency response work. The main cause behind the fast-spreading fires is dry conditions from the drought.

"The bushes, the trees have absolutely no moisture in them, and the humidities are so low that we are seeing these 'fire starts' just erupt into conflagrations," Ghilarducci said.

Lake County saw devastation in just the last two months. In late July, a wildfire east of Clear Lake destroyed 43 homes as it spread across 109 square miles. As firefighters drew close to surrounding that blaze, another fire erupted several miles from the community of Lower Lake on Aug. 9 and more than doubled in size overnight.

Residents in the area had to evacuate from their homes two times in as many weeks.

East of Fresno, the largest wildfire in the state continued to march westward and away from the Giant Sequoia trees, fire spokesman Dave Schmitt said. The fire, which was sparked by lightning on July 31, has charred 203 square miles and was 31 percent contained Sunday, the U.S. Forest Service said.

Firefighters have maintained a precautionary line around Grant Grove, an ancient grove of Giant Sequoia trees, and set prescribed burns to keep the flames from overrunning it.

Some fire came through the area but it hasn't done much harm, fire spokesman Frank Mosbacher told the Fresno Bee.

The grove is named for the towering General Grant tree that stands 268 feet tall. There are dozens of Sequoia groves in the Sierra Nevada, and some trees are 3,000 years old.