| 1 |
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| Mammatus Clouds |
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| There clouds are shaped like pouches and occur very rarely. They are caused by sinking air. But, Mammatus Clouds do not bring any storm. They generally form after the passing of a heavy storm. |
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| 2 |
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| Noctilucent Clouds |
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| Also known as the Polar Mesospheric Clouds, these clouds occur in the Polar Regions and are luminous. The luminosity is caused by reflecting the light of the sun from the sunlit sides of the earth. They are very rare. |
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| 3 |
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| Cirrus Kelvin-Helmholtz Clouds |
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| This type of clouds last for only a few minutes. They are shaped in horizontal spirals and are highly distinguishable and form at about 16,000 ft |
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| 4 |
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| Roll Clouds |
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| This type of clouds have a shape of a horizontal tube and form low in the sky. They are signs of a cold front and can indicate the presence of microburst activity. What actually happens is that the downdraft from a storm cloud demeans the warm updraft and as the cool air rises the warm air condenses and becomes a cloud and it often rolls with the winds below and above. |
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| 5 |
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| Shelf Clouds |
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| It is another form of arcus cloud having a horizontal wedge shape. This is also related to a gust front and also occurs without thunderstorms. The difference from roll clouds is that shelf clouds are joined with the parent cloud. |
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