The Gass Fire over the Sheep Range, Desert National Wildlife Refuge.
The fire burned so hot it drew in a monsoon storm to itself. The smoke rose straight up until they collided whith the monsoon storm clouds and both the smoke and storms cloud flattened against each other as can be witnessed in this image. I've never seen anything like it before.
Photo taken as I was driving off Mt Charleston after a hike. Mohave Desert, Las Vegas NV.