as mentioned in this earlier post, lenticular clouds are typically formed near mountains, as air, which flows over and down the their sides, will overshoot and spring back up (much like how a car will continue to bounce a bit after going over a speed bump). the air oscillates like this for a while, with clouds forming on the upward part of the wave as the moist rising air cools.
lenticular clouds are a bundle of movement, yet look stationary, as the flow of air up one side of the mountain replenishes the cloud on the windward side, while the dry air flowing down the other side dries the cloud out on the leeward side. these clouds can appear to hover for hours or even days until weather conditions change, and are even occasionally confused for ufos.
photos by (click pic) by chris picking, majeed badizadegan, jolly sailor, chris gin, larigan and lorenzo montezemolo. see also: circumhorizontal arcs, asperatus clouds, mammatus clouds, polar stratospheric clouds, noctilucent clouds, and more lenticular clouds
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