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Lenticular Clouds
There are any number of reasons why the vast majority of UFO sightings are spurious. Most occur in the United States, most are at night, and the few sightings made in the daytime generally involve lenticular clouds. It's true these remarkably smooth formations don't resemble clouds so much as giant lenses or saucers, but they look like spacecraft even less. Altocumulus lenticula
ris, their formal name, are most often seen on the downwind side of mountains or mountain ranges (although they can occasionally be found elsewhere), when stable, moist air is present.
The clouds are also notable for remaining in place for long periods of time, sometimes to the point of stacking up, one atop the other. Airline pilots generally avoid lenticular clouds because of the turbulence they can generate, although they're a favorite of gliders for their generous vertical lift.