overlaps cloud fog rainbow fogbow Often, fogbows are treated as separate from rainbows; however, as the formation processes are much the same, we currently classify these as a subclass of rainbow pending input from domain experts. envoAtmo fog bow A rainbow which forms through the interaction of sunlight with the water droplets which constitute fog or clouds; light is diffracted by these droplets such that the photometeor appears almost white with faint reds on the sky-facing side and faint blues on the planet-facing side of the bow.