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ruzuzu commented on the word roll cloud
"A roll cloud is a low, horizontal, tube-shaped, and relatively rare type of arcus cloud. They differ from shelf clouds by being completely detached from other cloud features. Roll clouds usually appear to be "rolling" about a horizontal axis. They are a solitary wave called a soliton, which is a wave that has a single crest and moves without changing speed or shape. One of the most famous frequent occurrences is the Morning Glory cloud in Queensland, Australia."
--Wikipedia (http://en.wikipedia.org/w/index.php?title=Arcus_cloud&oldid=467598168)
February 10, 2012