Here’s a classic example of a supernumerary rainbow, seen this weekend over New York. Les Cowley at Atmospheric Optics has written of this type of rainbow:
Look slightly inside a bright primary bow and sometimes you will see one or more predominantly green, pink and purple fringes. Their numbers and spacing can change from minute to minute. They are seen most often near the top of the bow …
Thank you, Alexander, for your photo!
Bottom line: Supernumerary rainbow NYC July 8, 2017.