Antelope Creek, Montana
Camping at the American Prairie Reserve, the storm around this worrisome cloud actually passed to the west of us, but it was a precursor of a sibling storm that hit us later in the evening. That storm brought strong winds, plenty of rain, and near-constant lightning all around, but thankfully only small hail. But that storm itself was a precursor of what was to come the next night a little further east when a storm brought 3″ hail and wind gusts to 113 mph. The area was later declared a disaster zone. Fortunately we headed further west, not east the next day and had a very calm night.