The images below may seem like something from out of this world, but they are actually rare thunderstorm clouds called a supercells.
The colossal storm systems center on mesocyclones, which are rotating updrafts that can span several kilometers and deliver torrential rain and high winds including tornadoes.
The first of several superstorm images below was photographed by Sean R. Heavey just west of Glasgow, Montana, in July.
Jagged clouds surround the supercell's core, which is filled with dust and rain swept by the wind.
The cloud caused minor damage in the area and lasted several hours before moving on, Heavey wrote on his website.
Scroll down to see photos of several astonishing supercell storms.