About 7.5 miles west of Medora north of I-94 and near Sentinel Butte.
ISO 100, 20 sec exposure at f8
We were in our trailer in an RV park near Medora, ND when a massive thunderstorm began to form. I quickly set up my tripod on a small hill nearby and took several 20 sec exposures at f8 and ISO 100. A thundering hailstorm followed.