Term
| A cloud of moderate or strong vertical development and doesn’t have a cirriform top: |
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Definition
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Term
| Consists of clouds formed by means other than the spreading out of CU and has clouds with bases at different levels: |
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Definition
| L8 (cumulus and stratocumulus) |
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Term
| In its earliest stage of development, this cloud type usually forms in, and suggests, good weather: |
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Definition
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Term
| Has a summit that lacks clear outline and isn’t clearly fibrous nor in the shape of an anvil: |
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Definition
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Term
| Forms from the spreading out of CU or CB clouds: |
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Definition
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Term
| Forms by means other than the spreading out of CU: |
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Definition
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Term
| Is in a more or less continuous sheet or layer, or in ragged shreds, or is a combination of both and bad weather isn’t present: |
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Definition
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Term
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Definition
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Term
| Often occurs below layers of Altostratus and Nimbostratus during bad weather: |
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Definition
| L7 (stratus fractus or cumulus fractus) |
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Term
| The greater part of this cloud type is semitransparent and the Sun or Moon is dimly visible as though you’re viewing it through ground glass: |
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Definition
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Term
| Forms from the spreading out of CU or CB clouds: |
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Definition
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Term
| Is sufficiently dense to hide the Sun or Moon: |
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Definition
| M2 (altostratus or nimbostratus) |
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Term
| This cloud type, the greater part of which is semitransparent, doesn’t progressively invade the sky: |
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Definition
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Term
| Has two or more layers, is opaque in places, and doesn’t progressively invade the sky: |
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Definition
| M7 (altocumulus or altocumulus with altostratus) |
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Term
| Is called a chaotic sky and occurs at several levels: |
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Definition
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Term
| Forms in patches and continually changes in appearance: |
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Definition
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Term
| Is arranged in bands or in one or more fairly continuous layers that progressively invade the sky: |
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Definition
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Term
| Forms sproutings in the form of small towers or battlements: |
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Definition
| M8 (altocumulus castellanus) |
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Term
| Often called a “mackerel sky.” |
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Definition
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Term
| A dense cloud and is often in the shape of an anvil: |
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Definition
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Term
| Uniform in structure, covers the celestial dome, and may have a halo as the only indication of its presence: |
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Definition
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Term
| Is in filaments, strands, or hooks that don’t progressively invade the sky: |
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Definition
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Term
| Progressively invades the sky and generally grows more dense, but the continuous veil doesn’t reach 45º: |
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Definition
| H5 (cirrus and cirrostratus or cirrostratus alone) |
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Term
| Can have sproutings in the form of small turrets or battlements: |
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Definition
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Term
| Is in the form of hooks and/or filaments that progressively invade the sky and become more dense: |
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Definition
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Term
| Progressively invades the sky and generally grows more dense. The continuous veil extends to more than 45º: |
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Definition
| H6 (cirrus and cirrostratus or cirrostratus alone) |
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Term
| This cloud type isn’t progressively invading the sky and doesn’t completely cover the celestial dome: |
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Definition
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