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Surprise high rise in the skies.
They're called "noctilucent clouds". Strange clouds at the edge of space, not where "normal" clouds are.
Above: Noctilucent clouds photographed by the crew of the ISS: more.
Here's the NASA article: http://science.nasa.gov/headlines/y2008/25aug_nlc.htm
And another great photo of them:
Above: Noctilucent clouds over Mt. Sabalan, a 15,784 ft extinct volcano in northwestern Iran. Photo credit: Siamak Sabet. [more ]
They're called "noctilucent clouds". Strange clouds at the edge of space, not where "normal" clouds are.

Above: Noctilucent clouds photographed by the crew of the ISS: more.
Here's the NASA article: http://science.nasa.gov/headlines/y2008/25aug_nlc.htm
And another great photo of them:

Above: Noctilucent clouds over Mt. Sabalan, a 15,784 ft extinct volcano in northwestern Iran. Photo credit: Siamak Sabet. [more ]