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Desert Virga in Reno, Nevada today. Photo by RenoSoHill. For more photos, visit wunderground.com

Desert Virga in Reno, Nevada today. Photo by RenoSoHill. For more photos, visit wunderground.com

A "fire rainbow," also known as an iridescent cloud, appears in the sky on July 31 over South Florida. The rare phenomenon occurs when clouds containing uniformly sized water droplets diffract light and scatter wavelengths into a colorful ring-like pattern. Iridescent clouds are formed by a different process than rainbows, which occur through refraction and reflection instead of diffraction.

A "fire rainbow," also known as an iridescent cloud, appears in the sky on July 31 over South Florida. The rare phenomenon occurs when clouds containing uniformly sized water droplets diffract light and scatter wavelengths into a colorful ring-like pattern. Iridescent clouds are formed by a different process than rainbows, which occur through refraction and reflection instead of diffraction.

My last night in Alaska rewarded me with a beautiful aurora. This was taken on Cleary Summit, north of Fairbanks. Photo by CenTexWeatherGal. For more photos, visit wunderground.com

My last night in Alaska rewarded me with a beautiful aurora. This was taken on Cleary Summit, north of Fairbanks. Photo by CenTexWeatherGal. For more photos, visit wunderground.com

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