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Friday May 22nd, 2015 10:35AM

Predator drone now part of Calif. wildfire battle

By The Associated Press
GROVELAND, Calif. (AP) -- As crews advanced against a giant wildfire around Yosemite National Park, fire commanders said they would maintain use of a Predator drone to give them early views of any new flare-ups across in the remote and rugged landscape.

The Rim Fire expanded to 301 square miles, but crews had a productive day Wednesday and containment increased to 30 percent. Cooler temperatures and lighter winds aided the firefighters.

Increasingly confident fire officials said they expect to fully surround the blaze in three weeks, although it will burn for much longer than that.

"We continue to get line around this fire," California fire spokesman Daniel Berlant said. "It's not nearly as active as it was last week."

The California National Guard drone deployed Wednesday was being remotely piloted hundreds of miles away, allowing ground commanders to keep an eye out for new fires they otherwise wouldn't have immediately seen.

"The drone is providing data directly back to the incident commander, allowing him to make quick decisions about which resources to deploy and where," Berlant said.

Previously, officials relied on helicopters that needed to refuel every two hours.

While unmanned aircraft have mapped past fires, use of the Predator will be the longest sustained mission by a drone in California to broadcast information to firefighters in real time.

The plane, the size of a small Cessna, will remain over the burn zone for up to 22 hours at a time, allowing fire commanders to monitor fire activity, determine the fire's direction of movement, the extent of containment and confirm new fires ignited by lightning or flying embers.

The drone is being flown by the 163rd Wing of the California National Guard at March Air Reserve Base in Riverside and is operating from Victorville Airport, both in Southern California. It generally flew over unpopulated areas on its 300-mile flight to the Rim Fire. Outside the fire area, it will be escorted by a manned aircraft.

Officials were careful to point out the images are being used only to aid in the effort to contain the fire.

In 2009 a NASA Predator equipped with an infrared imaging sensor helped the U.S. Forest Service assess damage from a fire in Angeles National Forest. In 2008, a drone capable of detecting hot spots helped firefighters assess movement of a series of wildfires stretching from Southern California's Lake Arrowhead to San Diego.

The Rim Fire started Aug. 17 and quickly exploded in size, becoming one of the 10 largest California wildfires on record. Its progression slowed earlier this week when it moved from parts of the forest with thick underbrush that had not burned in nearly a century to areas that had seen fire in the past two decades.

But it will burn for months, possibly until California's dry season ends this fall.

"My prediction is it will burn until we see rain," said Hugh Safford, a regional ecologist with the U.S. Forest Service.

That means the smoke could continue to foul air north of Yosemite in the Lake Tahoe basin and neighboring Nevada, although residents received something of a reprieve Wednesday when for the first time in three days blue sky was sometimes visible through the haze.

The air quality index in the Reno area still had improved only to the "unhealthy" level, and in Douglas County, Nev., school children were kept indoors again when the index registered in the "hazardous" category.

The air was clear, however, in the tourist mecca of Yosemite Valley, home to the towering Half Dome and El Capitan rock formations and the 2,425-foot plunge of Yosemite Falls.

The Rim Fire has destroyed 111 structures, including 11 homes, and posed a threat to ancient giant sequoias.

The fire also has threatened San Francisco's water supply at the Hetch Hetchy Reservoir, but Stratton said it was burning itself out as it approached and that crews were lighting back burns to push it back into the wilderness.
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