Photographer Antony Spencer shot this photo with a Hasselblad on the Montana plains — an impressive feat, given the size of the camera and required tripod, and the winds that blast into and out of a supercell. He wrote:
This incredible supercell formed as soon as this thunderstorm crossed the Rocky mountains and moved over the Great Plains in Montana.
Seeing the difference the sudden updraft makes to rotation in a storm like this as soon as it reaches the warmer air is pretty incredible. To stand and observe a storm of this magnitude moving towards you at 50mph is a very humbling experience, the warm air being sucked into the storm is incredibly strong and makes photography a little challenging at times! You knew when the supercell was getting too close as you would suddenly find yourself in the outflow with the wind completely changing direction instantly. Every little while you had to pack up quick knowing that the hail core carrying golf-tennis ball size hailstones was just moments away!
After nightfall this storm went on to produce a tornado near the town of Great Falls.
Be sure to check out Spencer’s photostream, which is full of gorgeous shots.