#PPOD: Sometimes called a "fire rainbow" (although involving neither fire nor a rainbow), a circumhorizontal arc occurs when sunlight refracts off of ice crystals in the atmosphere. This phenomenon is different from the more commonly seen ice halo and can be seen at twice the distance and parallel to the horizon. If the icy clouds are broken up, the arc will also be fragmented, leading to a "fiery" appearance. Taken on 11 August 2024 in the Sierra Mountains of California. Credit: John Harley