One hundred years of fuel build up, dry winter, enough rain in the spring to grow a good grass crop followed by a hot dry July and conditions are ripe for a big fire. Throw in high hot wind blowing up from the SE and you are looking at a fire that is unstoppable. Remington fire burned from WY to Birney over night. Went the rest of the way north the next day. The Tongue River Breaks Riding and Hiking Aria is entirely burnt along with quite a bit more of the Custer Forest.