 If you see some wispy clouds in a clear blue sky, you're looking at cirrus clouds. Cirrus clouds are spindly clouds that have a feathery, hair-like, silky sheen appearance to them. They form high in the sky and because of this they are always made up of ice crystals. Whether or not you can or cannot see through these clouds depends on how far apart the ice crystals are. Typically, when these clouds float over the sun's path, they hardly reduce its brightness. Before sunrise and after sunset, cirrus clouds are often colored bright yellow or red. These clouds are lit up by the sun long before other clouds and fade out much later. Plus, when you see cirrus clouds scattered in a clear blue sky, it is a good indicator of fair weather. Next time you're out and about, remember that cirrus clouds are most often associated with great sunrises and sunsets and nice weather. For the University of Wyoming Extension, I'm Glenn Owings, Exploring the Nature of Wyoming.