The gent in question was a Marine, as I recall, flying a single engine jet fighter, though I can't recall the type. He ejected over top of or at least very near to top of a rapidly developing T-storm.
He descended after his parachute opened automatically some 40 plus minutes after his ejection, which was witnessed by his wingman, so there' no doubt about the timing. Search parties were in the area looking for wreckage when he came floating out of a cloud, unconcious.
He was beaten to heck, but survived, with no major injuries. Ran into a little hail, but his helmet and flight gear protected him from much of the really bad damage that could have happened.
He wrote (or co-authored) a book, called "The Man Who Rode The Thunder". I've forgotten his name, but I'm sure Amazon could find it.
MTV