Green thunderstorms: there have been many theories behind the mysterious
glow
Full story:
https://www.abc.net.au/news/2018-12-21/what-makes-thunderstorms-green/10646304

In a festive twist to Sydney's catastrophically expensive hailstorm
Thursday night, the skies turned green.

Pictures posted online of clouds with a spooky green glow have been
generating debate.

There are lots of theories floating around the internet, but Dr Joshua
Soderholm, a research scientist at Monash University, can clear up a
little of the mystery.

"There's been a number of theories that have actually been slowly
disproven by science over the years," he said.

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So why green?

Dr Soderholm says the best theory is that the thunderstorms act as a
filter.

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Do green clouds foreshadow hail?

"That's what's thought, and even a lot of meteorologists think that as
well," Dr Soderholm said, adding that there is a link between the most
severe supercells and the green light.

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