Ohio Storm Clouds 

Images by Glenna Bayer.  Thick swathes of rain sweep across the landscape creating in the top image a bright rainbow fragment. We can imagine that it will be gone almost as quickly as it appeared. Below: The sky has darkened but there is still sunshine. Radial shadows cross the scene. They converge towards bottom left where the antisolar point and rainbow centre lie. They are cloud shadows, anticrepuscular rays better called antisolar rays. When these shadows fall on raindrops that would otherwise form a rainbow they generate rainbow spokes that appear to rotate.     Images ©Glenna Bayer, shown with permission
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