Kevin writes:

The twilight sky and its reflection over the reservoir in Ada Michigan, on a late August evening.

The strange colors of the twilights recently are due to volcanic eruptions in the Aleutian islands, and the dust, smoke, and other stuff high up in the atmosphere traveling around the planet.

This photo is part of his excellent Weather set (definitely view the slideshow). You might also enjoy Astronomy and Hummingbirds.

Here's his Flickriver.