Sydney spotted this rainbow cloud over our house at midday on Feb. 11. I was able to capture two shots of it before it vanished. These two photos were taken nine seconds apart, at 11:42 a.m. Eastern.
By 11:44, the rainbow effect had all but disappeared.
Was our rainbow cloud a circumhorizontal arc, sometimes called the rarest sky phenomenon in nature? (See this National Geographic item.) I'm glad we saw it, whatever it was.