National wildfire policy has changed significantly over the past century. After the “Big Burn” of Idaho and Montana in 1910, federal fire officials treated all fires as an enemy and instituted a “10 a.m.” rule seeking to snuff them out within a morning of spotting them.

What fueled the explosive growth of the Dragon Bravo Fire was a mix of gusty winds, dry air and above-normal heat – weather conditions experts described as atypical for this time of year, when monsoonal moisture typically tamps down wildfire risk across Arizona.