Fume emitted off of a text that says "Just Clouds..." with a noise map in the smoke and extra velocity slots.
The grid is 150x100x100. I only simulated to frame 25 and then duplicated the grid to use frame 10 and 25 as still frame (I set the out of range types to hold and set the start and end to the same frame). When closing in on the cloud i animated the Low Threshold up and the Opacity down...overall in order to have clouds "grow" or time lapse without simulation it you could animate low and high thresholds.
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