Green sky

Q: Why does the sky sometimes look green during a thunderstorm?

A: It’s a question that has been asked for centuries and is still not fully answered, said Brent McRoberts of Texas A&M University.

“We know the ancient Greeks reported seeing green skies during thunderstorms, and sailors for hundreds of years have written about green skies,” McRoberts explained. “The most popular theory is that thunderstorms contain a lot of water – often in the form of hail – and this water or ice tends to scatter green light during the strong updrafts that occur in severe storms. That’s why many people say the sky appears green right before a hailstorm.”

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2010-06-10 digital edition

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