The ISU webcam caught a glimpse of the spectacular light show Thursday evening. While the thunderstorms were not that strong, the air near the ground was rather dry. So when rainwater from these storms fell into this dry layer, it quickly evaporated and cooled the surrounding air. This cooled air then rushed to the ground producing brief gusty winds which then pick up dust to produce the ground dust storm. All of the red in the sky is a result of the Rayleigh scatters (dust and raindrops) scattering the blue light away.

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