Credit & Licence: Daniela Mirner Eberl
Explanation: What kind of cloud is this? A roll cloud. These
rare long clouds may form near advancing cold fronts. In particular, a downdraft
from an advancing storm front can cause moist warm air to rise, cool below its
dew point, and so form a
cloud. When this happens uniformly along an extended front, a roll cloud may form. Roll clouds may actually have air circulating along the
long horizontal axis of the cloud. A roll
cloud is not thought to be able to morph into a tornado. Unlike a similar shelf
cloud, a roll cloud, a type of Arcus cloud, is completely
detached from their parent cumulonimbus
cloud. Pictured
above, a roll cloud
extends far into the distance in 2009 January above Las Olas Beach in Maldonado, Uruguay.
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