VIDEO: Rare rainbow ray forms in the sky over Utah town

HERRIMAN, Utah -- A colorful rainbow cloud made for a spectacular sight to see in the sky over Herriman, Utah.

Wendi Fuller was driving home from work when she noticed a rainbow thicken in the sky.

After pulling into her driveway, she took out her cellphone and recorded video.

The video, which was posted to Facebook, has garnered over four-million views since its posting on March 19.

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According to AccuWeather, "cloud iridescence occurs when water droplets or ice crystals scatter light."

Rainbow clouds occur when light scatters through water droplets or ice crystals.