arcus"(Often called roll or shelf cloud.) A dense and horizontal roll cloud or wedge-shaped accessory cloud, sometimes appearing ragged and turbulent and other times smooth, occasionally with multiple layers.
arcus (arc) - arch, shelf, roll or wall cloud
incus (inc) - anvil
mamma (mam) - pouches hanging from underneath main clouds
pannus (pan) - ragged shreds of cloud
pileus (pil) - cap cloud ...
Arcus Cloud - A low, horizontal cloud formation associated with a thunderstorm's outflow. The air from a thunderstorm can fan out in 360ยบ. So, a cloud formed from this rush air can be in the shape of a smooth curve.
Arcus - A low, horizontal cloud formation associated with the leading edge of thunderstorm outflow (i.e., the gust front). Roll clouds and shelf clouds both are types of arcus clouds.
Arcus (Arc Cloud) A dense, arched-shaped, menacing-looking accessory cloud to a cumulonimbus that can occur along the leading edge of a thunderstorm's gust front as the consequence of uplift of stable warm air. Same as a shelf cloud.
ARCUS - The "left over" low-level clouds along the outflow regions of a dissipated thunderstorm.
Sheet iceIce formed by the freezing of liquid precipitation or the freezing of melted solid precipitation (see snow depth)Shelf CloudA low, horizontal wedge-shaped arcus cloud, ...
Shelf Cloud: A low, horizontal wedge-shaped arcus cloud, associated with a thunderstorm gust front (or occasionally with a cold front, even in the absence of thunderstorms).
A low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front (or a cold front).
The nine supplementary features and accessory clouds are incus, mamma, virga, praecipitatio, arcus, tuba, pileus, velum, and pannus. (Note: Although these are Latin words, it is proper convention to use only the singular endings, e.g.
Roll cloud A dense, roll-shaped cloud attached to the lower front part of the main cloud. It often forms with thunderstorms along the leading edge of a gust front. Also called an arcus cloud.
 See also: Cloud, Air, Temperature, Front, Storm
  
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