Cirrocumulus lenticularis

The Altocumulus is a kind of Nuage pertaining on the average floor: at the Latitude S moderated, its base ranges between 1.500 and 6.000 m height and its thickness are about 1.500 Mr. It is composed of plates, rollers, rollers, etc, white or gray, having generally clean shades. The passage of a bench of altocumulus in front of the Sun or the Moon can generate a crown around the star.

The altocumuli indicate a certain instability of the air in the layers where they appear. They can be formed in a clear sky, when an important mass of air is raised with average height and causes condensation partial of the steam which it contains (because of a relief or with the approach of a disturbance).

The most impressive altocumulus is the lenticularis (i.e. lenticular), one recognizes it by his shapes of lenses or lengthened almonds, with well delimited contours: they appear under the wind of a relief which the flow of air cannot circumvent and are maintained under the ascending “bellies” of waves of relief maintained by this flow after this one crossed the obstacle; in certain cases, these lenticular clouds can be superimposed in successive layers of air in kinds of “piles of plates”.

The altocumulus lenticularis was often the object of polemic: indeed, some confuse these clouds with unidentified flying objects Many lenticular are at the origin of extraterrestrial stories…

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