The rolling appearence of some clouds is a result of altitude and the amount of moisture in the cloud. In general cumulus clouds (cumulus is latin for “heap”), mammatus clouds (latin for udder) and pileus clouds (latin for skullcap), all of which are low to the ground and relatively heavy with water, have a billowy, rolling appearence.
When two air masses colide you get a front. If the conditions are such that warm air rises and carries with it moisture (clouds) and then this same air mass later cools and sinks back down, you could get rolling clouds. It’s an example of convection… Google convection and you will get your answer…
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