Images of dramatic green skies and ominous rain clouds were snapped on Tuesday as a series of severe storms approached Sioux Falls, South Dakota.
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Westward Hoboes Project Gutenberg
See the Sky Turn Green in South Dakota During Derecho Storm – NBC Connecticut
Green sky during a Storm in South Dakota : r/Damnthatsinteresting
Why did the skies turn bright green over South Dakota in the US?
A rare storm turned the South Dakota skies green. Here's why
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What was up with those green skies in South Dakota?
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May 31, 1985 — The United States–Canada Outbreak