Thunderstorms that have strong updrafts naturally tend to start to rotate, a phenomenon known as a mesocyclone. The rotation tends to make the storm have a circular cross section. Some mesocyclones go on to drop tornadoes, which are an extreme form of rotating weather phenomenon. Mammatus clouds, which appear like cotton puffs, can be seen hovering behind it. Farther in the distance, an amber sunset created a stunning juxtaposition between foreground and background, which made for a fantastic shot.