Roll Cloud - A relatively rare, low-level horizontal, tube-shaped accessory cloud completely detached from the cumulonimbus base.
Roll cloud
A low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front (or a cold front).
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.
Roll cloud A low, cylindrically-shaped and elongated cloud occurring behind a gust front; associated with but detached from a cumulonimbus cloud.
roll cloud (sometimes improperly called rotor cloud)—A dense and horizontal roll-shaped accessory cloud located on the lower leading edge of a cumulonimbus or less often, a rapidly developing cumulus; indicative of turbulence.
Roll clouds, shelf clouds, and wall clouds are examples of accessory clouds.AccretionThe growth of a precipitation particle by the collision of a frozen particle with a supercooled liquid water droplet which freezes upon impact.
Roll clouds, or arches, may form around the periphery of the storm. There may be rotation in a horizontal plane as well, and lowering of pressure can produce a mesocyclone, a miniature rotating low.
rotor cloud"(Sometimes called roll cloud.) A turbulent, altocumulus-type cloud formation found in the lee of some large mountain barriers, particularly in the Sierra Nevada near Bishop, California.
Unlike the roll cloud, the shelf cloud is attached to the base of the parent cloud above it (usually a thunderstorm).
Morning Glory - An elongated cloud band, visually similar to a roll cloud, usually appearing in the morning hours, when the atmosphere is relatively stable.
An elongated cloud band, visually similar to a roll cloud, usually appearing in the morning hours, when the atmosphere is relatively stable. Morning glories result from perturbations related to gravitational waves in a stable boundary layer.
A cloud which is dependent on a larger cloud system for development and continuance. Roll clouds, shelf clouds, and wall clouds are examples of accessory clouds.
Accretion ...
The leading edge of gusty surface winds from thunderstorm downdrafts; sometimes associated with a shelf cloud or roll cloud. See also downburst, gustnado, outflow boundary.
Gustnado ...
Arcus - a low, horizontal cloud formation associated with the leading edge of the thunderstorm outflow (i.e., the gust front); roll clouds and shelf clouds both are types of arcus clouds ...
Most prominent beneath the rain-free base and on the leading edge of an approaching thunderstorm. Usually marked by gusty, cool winds. The shelf or roll cloud sometimes accompanies the gust front, ...
Gust Front - The leading edge of gusty surface winds from thunderstorm downdrafts; sometimes associated with a shelf cloud or roll cloud. See also downburst, gustnado, outflow boundary.
If two or more of these gust fronts intersect each other, a new thunderstorm could possibly develop. Sometimes it is associated with a shelf cloud or roll cloud. Also, see downburst, gustnado, and outflow boundary.
SHELF CLOUD - A type of accessory cloud associated with outflow regions of a thunderstorm. Commonly associated with gust fronts. Do not confuse these with wall clouds. Sometimes called a ROLL CLOUD.
Roll Cloud:A mean looking cloud which spins & is located behind the gust front.
Rossby Waves:Discovered in the late 1930's by: Carl G. Rossby: a Swidish-American Meteorologist for whom they are named. Rossby Waves occur well above the friction level.
 See also: Cloud, Storm, Clouds, Thunder, Thunderstorm
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