Smoke from the southern end of the fire. Those dark clouds aren't storm clouds that's all smoke from the fire.
Panning to the north. I think the lighter orange in the clouds is a reflection of the fire, but I'm not sure about that.
My first view of the smoke from where I was staying. From here it actually looked like it was in Ft Collins itself because of the orange tint at the bottom of the smoke cloud.
Later in the day, this is a shot of the moon as it was setting behind the smoke clouds. It doesn't seem as red in the photograph as it did when I took the picture.