A very fun weather phenomena last week over the Denver metro area. Cloud iridescence is caused by clouds (usually cirrus) that have small water droplets or ice crystals in them causing the light to be diffracted, or spread out. The phenomena is much like the #rainbow colors seen with oil in water. Unfortunately I was out for a walk when this was happening and I only had my big wildlife lens so was unable to capture the overall scene.. Nevertheless, closeups show just how cool it was.