Cirrus castellanus – More vertically developed and have a turret-like summit.Cirrus floccus – These have a more cotton wool-like appearance than any other cirrus.Cirrus spissatus – Thick and dense, cirrus spissatus tends to dominate the sky above. ![]() Cirrus uncinus – Has a trademark hook shape.It appears as white parallel stripes which streak across the sky. Thin and fibrous, cirrus fibratus is often aligned with the high-altitude wind direction. Cirrus fibratus – The most common type of cirrus cloud.vertebratus (ve) – looking like ribs or bones.undulatus (un) – sheets with parallel undulations.translucidus (tr) – translucent enough to permit the sun or moon to be seen.radiatus (ra) – broad parallel bands converging owing to perspective.perlucidus (pe) – broad patches with some (small) gaps allowing the blue sky to be seen.opacus (op) – completely masks the sun or moon.lacunosus (la) – thin cloud with regularly spaced holes, net-like.duplicatus (du) – more than one layer at different levels.The varieties are grouped and named based on transparency and the arrangement of cloud elements, like so: ![]() Cloud species and varietiesĪll of the above represents a broad classification as each type of cloud can be further grouped by species and varieties. In reality, you’ll be lucky to get a light drizzle out of them. People often think rain is imminent when they see these clouds. Depending on the thickness of the cloud, stratocumulus will have light to dark gray hues. The base is well-defined and flat but the upper part of the cloud is ragged due to convection with the cloud itself. They resemble both stratus and cumulus clouds, hence the name. Stratocumulus looks like a thick white blanket of stretched-out cotton. Stratocumulus clouds are low-lying clouds that have a wide horizontal structure.
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