They often form over mountains or peaks & seem to hug them,Where stable moist air flows over a mountain or a range of mountains, a series of large-scale standing waves may form on the downwind side. If the temperature at the crest of the wave drops to the dew point, moisture in the air may condense to form lenticular clouds. As the moist air moves back down into the trough of the wave, the cloud may evaporate back into vapor.
Some seem to stack up forming some great shapes.
The last example, above, shows how easily these are taken as " Flying saucers"
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