you may notice a cloud in the sky that looks just like a rainbow. These so-called “fire rainbows” are actually known as circumhorizontal arcs and can occur when the sun has risen higher than 58° in the sky.
Aside from the position of the sun, the other ingredient to forming circumhorizontal arcs is cirrus clouds. Cirrus clouds are the thin, wispy clouds that occur at higher altitudes. Because the temperature is so low where these clouds exist, they are made of ice crystals. After the sun is higher than 58°, the light refracts through the plate-like crystals, which act like prisms and create the rainbow.
Jpr: Saw me one ...took pic with my iPhone. Not the best camera for this but the only one I had...see previous post
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