1.5 miles east of the East Entrance to Yellowstone Nat'l Park, Wyoming
This was the sky our first night at the Shoshone lodge. We had to go down the road to eat and this amazing cloud formation was coming up over the mountains of Yellowstone. We wondered, at first, if it wasn't Old Faithful, but it wasn't. Still have no idea what created this bizarre and interesting cloud formation. It was more like steam than a cloud and it was fast moving. And quite beautiful! I can see an angel flying in the shadows.