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Imminent Stormageddon. I've seen hundreds of these storm formations before. They say that it means there will be a tornado soon. But sometimes the warm air from below and the cold air from above doesn't quiet work together, and it just gives you this spectacular effect.
I like how the shadows of the clouds create a "drag" effect on each cloud. The different colours of the clouds also make this picture interesting (Blue to White to Red) I actually seen a beautiful sunset when I was riding a plane to Jakarta last year. There were mixtures of blue, red, yellow, and black, which blended in well. I think I do have a picture of it somewhere....