An arcus cloud feature is a long, dark shelf or roll of cloud that projects from the front edge of a storm system. Margaret Hall (Cloud Appreciation Society Member 67,720) spotted one emerging from the gloom over Lake Michigan as a Cumulonimbus storm cloud approached Little Traverse Bay in Petoskey, Michigan, US. The two dark patches below the roll seem like standing stones supporting Margaret’s arcus: an ominous Stonehenge of the sky.
In Album: Roger's Timeline Photos
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