If you know of a balloon that punches a hole in clouds due to extreme speed in departure, and has a skin like moving static, that can just show up in restricted airspace with no warning, stay in one place for 20 minutes, and can give off a static charge that several witnesses feel when it leaves...do let me know.EDIT: Now that I see Jeff's response above (which must have appeared while I maniacally typed my own magical words herein) I must say that the description is REMARKABLY like a balloon.
Until such time, I'm afraid you're talking out of your ass. In 20+ years I've found the vast majority of UFO sightings I've been involved in working on to be mundane explanations, or hoaxes.
This may not be one to hang my hat on definitively, but I'm sure this was no balloon, nor any mundane answer. I don't know what it was. Military, perhaps, but who knows. We probably never will.