Mammatus clouds are a common sight while storm chasing, but never have I seen them in a sunset like this. They seemed to become more defined and filled nearly the entire sky as the sun sank lower. The fiery colors were so intense that I had to cut back on the saturation. A strong MCS (mesoscale convective system) had moved off to the east as I was passing through Wheatland on my way home. When I noticed this sunset developing I searched for something nearby to serve as a foreground and this old tractor did the trick. Mammatus clouds usually form beneath the anvil of a strong thunderstorm, which means they can be either ahead of or behind the storm. The lobes are about 500m wide on average and show a sinking motion, making it look like the sky is falling. Pilots typically give mammatus a wide berth because of the turbulence they bring. Even though they happen frequently, their formation is not very well understood.