Overview

roll cloud


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1 A general term for the arcus type of supplementary cloud feature.

2 More specifically, a relatively rare, low, horizontal roll of cloud that accompanies a cold front, a line squall, or a thunderstorm gust front. It is completely detached from the main cloud mass, unlike the more common shelf cloud, and normally appears to be rotating about a horizontal axis.

Subjects: Meteorology and Climatology.


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