A fogbow is an almost identical meteorological phenomenon to a rainbow, but it’s completely white. Both are formed from sunlight passing through moisture, but while rainbows display a range of colors reflecting through water droplets, a fogbow appears when the water is much smaller. They can only be seen coming out of fog or clouds when the water is in mist form, and the diffraction through the mist removes all color. You’re likely to see a fogbow when the sun is breaking through fog, or over the ocean. Sailors sometimes call fogbows “seadogs,” and you might also hear it called a “cloudbow,” “mistbow,” or “white rainbow.”