I've long enjoyed looking for ice haloes and other interesting optical phenomena in the sky. Since I discovered
this Web site about them a few years ago, I've gotten better at finding them. In November 2001, I saw a complex display in Virginia involving several kinds of arcs, and e-mailed the site's creator about it; his recommendation was "always carry a camera". Words to live by.
Well,
samantha2074 is on the road this week and has the camera with her, and I usually don't make a habit of bringing my camera to work anyway, so this was a lost opportunity... but today, a little after noon, I saw what I think was a partial
circumhorizontal arc. You don't see those very often.