![]() In March 11 new kinds of cloud were officially recognised by weathermen. The other subtype of arcus is a shelf cloud, which also often appear to precede storm fronts. Going by the name volutus, the new species is described in the guidebook as 'long, typically low, horizontal, detached, tube-shaped cloud mass' and often appears to 'roll slowly about'. The British Met Office and World Meteorological Organisation said it had made the decision after exhaustive research – with many pictures sent in by amateur cloudspotters around the world. The new cloud species name will now be used by meteorologists operationally around the world. The cloud species - similar to arcus - was last year officially named as a new species of cloud in the World Meteorological Organization's Cloud Atlas. When this happens uniformly along an extended front, a roll cloud may form. They are caused by a downdraft from an advancing storm causing moist warm air to rise, cool below its dew point and form a cloud. Roll clouds are horizontal and do not connect to the ground.
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