If a huge thundercloud isn’t transient, nothing is. We outran this one in Iowa in the summer of 2010, on our way to Hillsdale College in Michigan. It nearly caught us when we stopped for lunch, but we got to our destination before the storm broke.
I took this picture through the front windshield of the car while it was driving down the highway. Honestly, it felt like we were being pursued by the Devil. Maybe we were.