rain falling from a summer thunderstorm backlit by lightning, stars are visible in the night sky above the storm, and the canyon is lit by a nearly full moon, Grand Canyon National Park, summer photo copyright by Adam Schallau
~~Iridescent Cumulus cloud near Melbourne, Victoria, Australia by Ern Mainka~~ I've seen these rainbow coloured clouds a few times in the Victorian High country. this one is way more colourful, but what I saw was pretty amazing.
Cloud Art or Nature's Cloud Symphonies: this multi-coloured cloud phenomenon is called Sundog: rainbow cloud when ice crystals appear in clouds & refract sun's rays. Photographer Robert Arn, here in Heyworth, Illinois, US