When most people look up in the sky, they see normal, fluffy clouds. If you happen to live in an area with severe weather, you may be able to get a glimpse “mammutus” clouds, circular looking odd balls that appear due to severe weather conditions. If you are lucky enough (unlucky?) enough to live close to a geographic location with a high altitude, you may be able to enjoy the sight of “lenticular” clouds.
What exactly are lenticular clouds? If you really want to know, go google it. If you would much rather see an example, then dart your eyes to the following photo (take on December 2008 in Seattle, Washington USA):
…I’m still not convinced those aren’t UFOs.
[via NASA, image credit: Tim Thompson]