Theme - Weather - Clouds #1 - lenticular / mountain wave
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Lenticular clouds (Altocumulus lenticularis in Latin) are stationary clouds that form in the troposphere, typically in perpendicular alignment to the wind direction. They are often comparable in appearance to a lens or saucer. Because of their unique appearance, they have been brought forward as an explanation for some UFO sightings.
They do not form over low-lying or flat terrain, thus many people may have never seen one before. Bright colours (called iridescence) are sometimes seen along the edge of lenticular clouds.
As air travels along the surface of the Earth, obstructions such as mountains or hills disrupt the flow of air into "eddies", or areas of turbulence, just like rocks in a stream.
When moist, stable air flows over a larger eddy, a series of large-scale standing waves form on the downwind side of the mountain. If the temperature at the crest of the wave drops below the local dew point, moisture in the air may condense to form these clouds. Under certain conditions, long strings of lenticular clouds can form near the crest of each successive wave, creating a formation known as a "wave cloud." These wave systems can produce powerful updrafts, so pilots of powered aircraft avoid flying near them - but ironically, pilots of unpowered aircraft - gliders, paragliders - actively seek them out, as they provide lift.
More mountain wave:
https://www.jigidi.com/created.php?id=ZIY3QXCE
They do not form over low-lying or flat terrain, thus many people may have never seen one before. Bright colours (called iridescence) are sometimes seen along the edge of lenticular clouds.
As air travels along the surface of the Earth, obstructions such as mountains or hills disrupt the flow of air into "eddies", or areas of turbulence, just like rocks in a stream.
When moist, stable air flows over a larger eddy, a series of large-scale standing waves form on the downwind side of the mountain. If the temperature at the crest of the wave drops below the local dew point, moisture in the air may condense to form these clouds. Under certain conditions, long strings of lenticular clouds can form near the crest of each successive wave, creating a formation known as a "wave cloud." These wave systems can produce powerful updrafts, so pilots of powered aircraft avoid flying near them - but ironically, pilots of unpowered aircraft - gliders, paragliders - actively seek them out, as they provide lift.
More mountain wave:
https://www.jigidi.com/created.php?id=ZIY3QXCE
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