Photographer's Note

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Explanation of the phenomena:
The lenticular clouds are more frequent in mountain than at the seaside. They are caused by a standing wave. The lenticular clouds are clouds of wave, which are formed when humid air is raised in the ascending part of the wave, when the raised air cools and that the water which it contains condenses in the form of water drops or of crystals of ice. Conversely, when the air goes down again on the other side of the wave, it is heated and the water drops evaporate. The lenticular clouds most known, because observable more frequently, are those which occur on the level of standing waves, themselves generally related to the relief. These clouds thus appear stationary, but the air and the water which they contain are in perpetual renewal. A famous example is "l'âne du Mont-Blanc" (the ass of the Mont-Blanc), lenticular cloud which frequently caps the Mont-Blanc, in France. Another is the "nappe" (tablecloth) of the mountain of the Table, beside the city of the Cape, in South Africa. Close to the coasts, especially when they present a certain relief, the winds coming from the sea are forced to go up, and there are waves (which are used besides by the followers of the hovering in deltaplane or other, and by the gulls) which can give place to clouds of waves. In mountain, the waves formed on the reliefs are not limited to the wave located just above the top of a mountain, a "wave train" are formed and been able to give place to a series of lenticular clouds, at the top of each wave (that's what you can see on my picture). Another type of lenticular cloud is frequently observed above clouds with strong vertical development, like the cumuli congestus or the cumulonimbi. This cloud, which takes the aspect of a "hat" of the principal cloud, is named "Pileus".

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Additional Photos by Trabelsi Isabelle (ilouy) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 306 W: 212 N: 173] (3370)
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