The clear nights this summer have been great for spotting these semi-rare "noctilucent clouds" this month. They are the mysterious clouds that are hundreds of thousands of feet up in the atmosphere and get their glow from being so high up, it reflects sunlight even after the sun has dropped far below the horizon. The one above was taken by Reid Wolcott, a research assistant in the UW Atmospheric Sciences Department.
Here are some more:
From Dylan in Olympia:
From Robert Lohr:
And another one from Reid Wolcott, titled "Good vs. Evil"