Circumhorizontal Arcs, Sun Halos, & Iridescent Clouds

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On June 12th, we had cirrus clouds moving into the region. Cirrus clouds are made up of tiny ice crystals. These crystals can refract or bend light, which will create a rainbow in the sky, without needing the rain. Rainbows will form on the opposite side of sun, but when the light is being refracted in a cirrus cloud, it will be on the same side as the sun. This phenomena is called Circumhorizontal Arcs or fire rainbows. 

 22° Halos and Iridescent clouds were also spotted yesterday. These are created from the ice crystals in cirrus clouds too. 


Lou – Brockway
Sheena DuBois

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