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Definition Of:

roll cloud

Bible DictionaryMeteorology & Weather Dictionary
A relatively rare, low-level, horizontal, tube-shaped cloud. Although they are associated with a thunderstorm, they are completely detached from the base of the cumulonimbus cloud.
Bible DictionaryWeather Dictionary
A low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front (or sometimes with a cold front ). Roll clouds are relatively rare; they are completely detached from the thunderstorm base or other cloud features, thus differentiating them from the more familiar shelf clouds . Roll clouds usually appear to be "rolling" about a horizontal axis, but should not be confused with funnel clouds .
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