Genera
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Layer (or sheet) of puffy clouds
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Stratocumulus
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Extremely tall and dense, in the form of a tower
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Cumulonimbus
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Fibrous, delicate filaments in the upper troposphere
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Cirrus
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Blue-grey striated layer of clouds, mid-troposphere. Sun is partially visible through this cloud
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Altostratus
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White-grey sheet of cloud, rounded masses, sometimes partially fibrous or diffuse
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Altocumulus
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Grey cloud layer, made diffuse by continuous precipitation
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Nimbostratus
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Generally grey cloud layer with a uniform base, sometimes bringing drizzle, snow, or snow grains
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Stratus
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Thin layer of small grain-like clouds in the upper troposphere
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Cirrocumulus
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Detached clouds in the form of rising mounds
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Cumulus
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Transparent, whitish cloud veil, capable of producing halo phenomena
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Cirrostratus
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Species
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Unique to cirrus; often shaped like a comma, terminating at the top like a hook
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Uncinus
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A long, horizontal, tube-shaped cloud mass
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Volutus
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Unique type of the cloud above
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Morning Glory
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Upward-protrubing puffy mounds beginning to lose their cumuliform outlines, with no cirriform part visible
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Calvus
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Clouds in the form of irregular shreds, which have a clearly ragged appearance
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Fractus
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Puffy cloud with limited vertical extent, and which appears as flattened
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Humilis
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Upper tropospheric-cloud, dense, which appear greyish when viewed in front of the sun
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Spissatus
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Shape of lenses, almonds, or UFOs
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Lenticularis
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Like a nebulous or ill-defined cloud veil or layer
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Nebulosus
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Small tufts with a cumuliform appearance, the lower part of which is ragged
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Floccus
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Strongly sprouting cumuliform cloud, the upper portion of which resembles cauliflower
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Congestus
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Spreads out in an extensive horizontal layer
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Stratiformis
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Detached clouds or a thin cloud veil, consisting of straight or slightly curved filaments that do not end in hooks or tufts
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Fibratus
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Often in the form of an anvil, with a fibrous cirriform top
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Capillatus
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Cumulus of moderate vertical extent, with sprouting at the top
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Mediocris
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Cumuliform protuberances in the form of turrets
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Castellanus
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