I couldn't fully capture what it looked like in person. I usually like cloudy sky where the light is more even for these kinds of pics, but wouldn't have caught the rainbows without the sun. I know one guy that says he has a picture here with seven rainbows in it.
Because of the extreme contrast lighting conditions, I used an ND4 filter with a CP filter attached, and took 5 bracketed shots from a tripod. Combined 4 of them to get the final pic.