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Mushroom Cloud East of Madison

I had to pull into the Edgewood College parking lot to get a clear field of view for my iPhone. It was as if a hydrogen bomb had gone off in the distance -- and, energywise, it had. To give you some idea of the scale of this thunderhead, it was about 20 miles east of the city when the photo was taken. There's a lot of energy packed into the intensely hot, humid weather we've been having. A typical thunderstorm has about the same amount of energy as a small H-bomb. It just doesn't release it all at once.

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Taken on July 18, 2011