@Rarebear I don’t recall which it was, but my information about the nature of ball lightning came from a peer-reviewed scientific journal. I did however find this: http://www.physorg.com/news68812957.html
I could probably find more from the Forteans, but I’m guessing you don’t regard them as credible.
@YoBob When I said it was empirically demonstratable, I meant that you, yourself could verify it. Strictly speaking, since it could only be demonstrated to you, personally, and not to an outside observer, it would qualify as revelation rather than empiricism, but as a radical Berkeleyan empiricist, my definition of empiricism is probably rather different from yours.