lenticular cloud

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lenticular cloud

[len′tik·yə·lər ′klau̇d]
(meteorology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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As Central Weather Bureau (CWB) officials recognized, the phenomenon is completely natural, and known as a lenticular cloud. Lenticular clouds form when air fronts of differing temperatures meet and generate a circular current.
Nevertheless, clouds do take the form of what sci-fi fans normally call a "UFO." These clouds, called "(https://www.ibtimes.com/ufo-captured-flying-over-tennessee-ufo-enthusiast-explains-mysterious-sighting-2790352) lenticular clouds ," look like huge discs that resemble what the movies portray as alien spaceships.
But lenticular clouds of the type supposedly seen at Gallipoli have frequently been mistaken for UFOs.
Lenticular clouds, as they are called, are formed when stable moist air flows over mountains.
Though a roll cloud may not be seen, strong chinooks are often accompanied by spectacular multiple-layered standing lenticular clouds ("altocumulus standing lenticular" or ACSL) and a chinook arch, a broad mid-level altocumulus or cirrus cloud extending leeward from the mountains.
Above this drier air layer, there is reasonably responsive air as one will have seen when cloud towers reach these levels and lenticular clouds form as a cap on the upthrusting cumulus head.
However, scientists say the unusual formations are Lenticular clouds, which form at high altitudes.
If moisture and temperatures are right, lenticular clouds can form, but it's more common to simply find small, stratus clouds evenly spaced downwind from the mountain.
eat lunch and watch ominous, lenticular clouds form around the icy peaks
l Lenticular clouds. Lens shaped clouds that look remarkably like a flying saucer.