Those are standards the government follows to protect firefighters, which were toughened after a wildfire tragedy in Colorado nearly two decades ago. On Tuesday, investigators from around the U.S. were arriving in Arizona to examine whether 19 highly trained firefighters who perished over the weekend heeded those rules or ignored them and paid with their lives.
In the nation's biggest loss of firefighters since 9/11, violent wind gusts Sunday turned what was believed to be a relatively manageable lightning-ignited forest fire in the town of Yarnell into a death trap that left no escape for the team of Hotshots willing to go to the hottest part of the blaze.
The tragedy raised questions of whether the crew should have been pulled out much earlier and whether all the usual precautions would have made any difference at all in the face of triple-digit temperatures, erratic winds and tinderbox conditions that caused the fire to explode.
In 1994, 14 firefighters died on Colorado's Storm King Mountain, and investigators afterward found numerous errors in the way the blaze was fought. In the Storm King tragedy, a rapid change in weather sent winds raging, creating 100-foot tongues of flame. Firefighters were unable to escape, as a wall of fire raced up a hillside.
The U.S. Forest Service revised its firefighting policies as a result of the blaze.
"The reforms after Storm King were collectively intended to prevent that from happening again, which was mass entrapment of an entire Hotshot crew," said Lloyd Burton, professor of environmental law and policy at the University of Colorado.
"There are so many striking parallels between this tragedy and what happened on Storm King in 1994, it's almost haunting."
Those changes included policies that say no firefighters should be deployed unless they have a safe place to retreat. They must also be continuously informed of changing weather.
"If you don't have those things in place, it's not advisable to deploy a team in the first place, because you can't guarantee their safety," Burton said.
The Hotshot team from Prescott entered the smoky wilderness over the weekend with backpacks, chain saws and other heavy gear to remove brush and trees and deprive the flames of fuel.
But the blaze grew from 200 acres to about 2,000 in a matter of hours as "the wind kicked up to 40 to 50 mph gusts and it blew east, south, west -- every which way," said Prescott City Councilman Len Scamardo.
"What limited information we have was there was a gust of wind from the north that blew the fire back and trapped them," Scamardo said.
Retired smoke jumper Art Morrison, a spokesman for the Arizona State Forestry Division, said it's essentially a judgment call as to whether a spot can work as a safe haven to escape to if the flames suddenly blow toward crews and they have to flee for their lives.
"Whatever they used as a safety zone just didn't work," he said.
Dick Mangan, a retired U.S. Forest Service safety official and consultant, said it is too early to say if the crew or those managing the fire made mistakes.
"This just might have been a weather anomaly that nobody saw coming that happened too quickly to respond to," Mangan said.
He said the crew members might have taken too many risks because they were on familiar ground and were trying to protect a community they knew well.
"When you've got especially structures and residences involved, and you've got local resources, there's a fair amount of social and political pressure, some of it self-generated by the firefighters, who want to do a good job," Mangan said. "They don't want to see a community burn down. They want to get in there."
A team of fire officials drawn from across the country by Atlanta NIMO, or National Incident Management Organization, arrived in the area Tuesday to find out exactly what went wrong.
They plan to make their way into the charred fire scene and issue a preliminary report in the coming days, said Mary Rasmussen, a spokeswoman for the Southwest Area Incident Management Team.
Weather reports from around the time of the firefighter deaths show how volatile the wind became. At 4 p.m., the wind was blowing out of the southwest, but one hour later, it had switched to the exact opposite direction and dramatically increased in speed. It was gusting at 22 mph at 4 p.m. but was at 41 mph by 5 p.m.
On Tuesday, about 500 firefighters were battling the mountain blaze, which had burned about 13 square miles. Yavapai County authorities said about 200 homes and other structures burned in Yarnell, a town of about 700 people. Hundreds were evacuated.
More Nation & World Headlines
Drivers on drugs: Study links roadway accidents to legalization of marijuana S. Sudan president, rebel leader trade blame for fighting GOP: Planned Parenthood spends federal money on politics Obama says fight against Islamic State group will take time Congress: U.S. fails to stop most people trying to join ISIS Yemen officials: Death toll from strikes on wedding at 131 CIA pulled officers from Beijing after breach of federal personnel records Maine college researchers discover new microscopic organism
Our new comment system is not supported in IE 7. Please upgrade your browser here.