This Rare Type Of Rainbow Was Captured On Film In South Carolina

A sign from above?

South Carolinians near Charleston were surprised on Sunday by one of nature's rarer, and more beautiful, phenomenas: iridescent, prismatic clouds forming a fire rainbow

Pictures of the incredible rainbow quickly spread around the internet. 

The scientific term is "circumhorizontal arc."

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Rare fire rainbow - Moray, Scotland

CBS station WCSC meteorologist Justin Lock explained the strict conditions that must be met before these spectral rainbows appear...

Firstly, the rainbows only appear in cirrus clouds made up of ice crystals at high altitudes. But there's also some geometry involved.

Fire Rainbow! What does it mean?

"To produce the rainbow colors the sun's rays must enter the ice crystals at a precise angle to give the prism effect of the color spectrum," Lock explained to WCSC

Fire rainbow

The effect of ice crystals and that precise angle of light is astonishing...

Fire Rainbow

Amazing, right? Keep your eyes on the skies.

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