Here’s a “roll cloud” (click image twice for full size):
You can see quite a few weird clouds in this post. And here’s one that was spotted over Moscow earlier this month:
Strange clouds
Here’s a “roll cloud” (click image twice for full size):
You can see quite a few weird clouds in this post. And here’s one that was spotted over Moscow earlier this month:
Later On 
Wow, very strange cloud formation. What could be the reason for all these strange cloud formations all happening at once. Scientific experiments perhaps?
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