GRAND RAPIDS, Mich. (WOOD) — It can stop you in your tracks if you spot it — a rare upside-down rainbow! This kind of rainbow formation is called a circumzenithal arc (CZA), and technically, it isn’t ...
"When it comes to atmospheric optics, one of the most captivating and awe-inspiring phenomena is the circumzenithal arc," reads the Atmospheric Optics website. "Imagine a rainbow that has escaped its ...