QUOTE(dcman @ Sep 10 2007, 02:10 PM)

That's the problem with reported UFOs pictures like this one, it could easily be a weather balloon with the sun shinning on it. Weather ballons are not uncommon during an electrical storm. A video would have been nice for sure. Even a close up shot would be better.
edit: I am not saying it is a weather balloon, I'm just saying it could be one.
It could be an anything, a shiny helium balloon you get at your local grocery store. There is no object near it to get a frame of reference as to the size of the object. I don't think you can tell anything from this picture other than its an object you cannot identify.