The most popular answer is 'SCUD'.
Scud is a term applied to low drifting clouds, typically below a cloud from which rain is falling.
Other definitions of scud from Dictionary.com:
- to run or move quickly or hurriedly.
- Nautical. to run before a gale with little or no sail set.
- Archery. (of an arrow) to fly too high and wide of the mark.
- the act of scudding.
- clouds, spray, or mist driven by the wind; a driving shower or gust of wind.
- low-drifting clouds appearing beneath a cloud from which precipitation is falling.
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