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Not the best example of these clouds, I just happened to have my camera ready when I noticed these. This is a crop area from #2
Each ball is about two inches (5 cm) in diameter.
Photographed during a hike at West Bar, Washington to see
the huge ripples caused by Ice Age floods.
Flooding caused Winter Camp Wash (a stream in Arches National Park) to dump sand onto the park road. Width of scene is about 3 feet (0.9m).
Tributary stream (wash) in Cache Valley in Arches National Park.
Water flowed from top to bottom.
Width of scene is about 2 feet (0.6m).