I can't see shit in your picture. Sorry.
Don't you know things about cloud formations and what-not? Take a look at this picture.. in the very middle http://img822.imageshack.us/img822/4071/photolb.png It was a straight line cloud.. looked like a missile or something but it just ended without any connection to the ground. There was also what seemed to be a circle surrounding the formation at the top of it. Pretty shitty picture because it was taken with my phone.. but any idea what it is/how it's caused?