Lenticular clouds are frequently mistaken for UFOs due to their smooth, saucer-like appearance.

Lenticular clouds, scientifically known as Altocumulus lenticularis, are stationary clouds that form at high altitudes, typically between 6,500 and 16,500 feet. They are created through a process called orographic lifting, which occurs when stable, moist air is forced upward by a mountain range or large topographical feature. This movement creates a series of standing waves on the downwind side of the mountain, similar to the ripples seen in water flowing over a submerged rock.As the air moves through the crest of these atmospheric waves, the temperature drops below the dew point, causing the moisture to condense into a cloud. When the air descends back into the trough of the wave, it warms and evaporates, leaving a distinct, lens-shaped cloud that appears to hover motionless despite strong horizontal winds. This stationary nature and symmetrical, disc-like shape have historically led to numerous UFO sightings, particularly near peaks like Mount Rainier in Washington State.One of the most famous incidents occurred on June 24, 1947, when pilot Kenneth Arnold reported seeing nine objects near Mount Rainier, sparking the modern 'flying saucer' craze. Meteorological studies later suggested that lenticular clouds or atmospheric mirages could have been responsible for such sightings. Pilots often avoid these clouds because they indicate severe turbulence and powerful downdrafts, known as 'rotor' zones, which can be dangerous for aircraft. In contrast, glider pilots seek out these wave systems to reach record-breaking altitudes by riding the upward-moving air currents.