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Cortège d'Altocumulus lenticularis (600 x 800 - 47 Ko)

©André Gillet [info]

Photo taken on Thursday 01 July 2004 in Cogne Vallée d'Aoste Italie
[Digital Photo Camera]
CANON Powershot A 70
Exposure : 1/800
[Without telescope]
seen 1071 times
Author 's note :
A 20h54, quelques minutes avant le coucher du soleil, vent du Nord-Ouest soutenu.
Ce type de nuages se rencontre assez fréquemment dant les régions montagneuses. Ils se forment sous le vent de chaînes de montagne en cas de vent fort. Ils sont stationnaires et marquent les crêtes des ondes de gravité invisibles dans le vent descendant de la montagne (voir le site remarquable de Harald Evens, à qui j'emprunte la description du phénomène (/www.weather-photography.com/photographer.php).

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