Since August 2011, six fires have raged through the pinon and shrub in the Pine Nut Mountains, devouring more than 18,000 acres, sending huge plumes of smoke into the air east of Carson Valley.Until Friday morning's rain, ash devils played across the mountains where dry conditions and winds conspired to imitate the fires that raged across the mountains over the last year.The three biggest fires were caused by human action, including the 3,900-acre Ray May fire in August 2011, which started as a result of a improperly extinguished campfire, the 7,500-acre TRE fire begun by an improperly extinguished backyard burn …