GOLDEN VALLEY, Minn. - KARE 11 Viewer, Peter Xiong asks: "Why does the sky turn green when a thunderstorm is coming?"

The simple answer is because of light from the sun. In more detail, we see the color green develop because the thunderstorm is very tall and deep. It contains a lot of rain droplets and possibly contains ice or hail. When the sun is setting or rising, the light coming through the atmosphere contains more red and less blue. When this red light passes through the thunderstorm and the large rain drops and possible hail, those objects absorb the red light leaving green light behind.

So when you see a thunderstorm moving in and it's green, its because the storm is large and has a lot of rain, but hail may be on the way.

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