The rarest "atmospheric phenomena," if you leave it at that and don't specify "optical," would have to be ball lightning. Reported, scientifically credible, and recently simulated in the lab, but never caught on film. That's my vote anyway. Dan ----- Original Message ----- From: <ketelsen@xxxxxxxxxxxxxx> To: <az-observing@xxxxxxxxxxxxx> Sent: Monday, March 12, 2007 2:36 PM Subject: [AZ-Observing] Re: [Fwd: CHECK THIS RAINBOW!] > So is there any agreement on what would be "the rarest of all naturally > occuring atmospheric phenomena" (notice - no shouting)? I suspect we > would have to get specific on location - aurora are rare at the equator, > but not so much in Alaska... > > -Dean > > > > -- > See message header for info on list archives or unsubscribing, and please > send personal replies to the author, not the list. > > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.