According to the unattributed news snippet posted in the comments, probably lightning. We've been having the annual spring thunderstorms (and associated tornado watches and warnings), so I expect that's probably the case.
I'm amazed, and, sadly, shouldn't be, at how quickly the conspiracy theorists crawled out of the woodwork over this one. *twitch*
(But, you know, the Project Blue Rose site STILL gets hits from a conspiracy-theorist forum about blue roses so I am obviously a DISINFORMATION VECTOR.)
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*thinks* I wonder how this would go if set against the music from Close Encounters of the Third Kind
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(But, you know, the Project Blue Rose site STILL gets hits from a conspiracy-theorist forum about blue roses so I am obviously a DISINFORMATION VECTOR.)