Supercell at twilight, Olney, Texas
Summer storm over Snake River, Grand Teton National Park
Speaking of clouds, I learned on newswatch.nationalgeographic that cloud watchers believe they have discovered a new cloud type which they have designated as undulatus asperatus. In fact, there's an organization called The Cloud Appreciation Society that is actively lobbying for official recognition of the name. This photo of undulatus asperatus, taken in 2009 over Cedar Rapids, Iowa, got the movement started.