Lenticular clouds are smooth, lens- or saucer-shaped clouds that commonly form in standing air waves near mountains. Their distinctive shape can remain nearly stationary even while strong winds blow through them.
The mountain-wave explanation
When stable, moist air flows over a mountain range, it can oscillate up and down on the other side. Air cools as it rises through the wave, allowing moisture to condense; air warms and droplets evaporate as it descends.
Why the cloud seems frozen in place
The visible droplets form in the rising part of the wave and disappear in the sinking part. Individual air parcels keep moving, but the cloud outline can stay in roughly the same location, like water continuously passing through a standing wave.
Are lenticular clouds dangerous?
The cloud itself is not a threat to people on the ground. However, its presence can indicate strong winds, mountain waves and sometimes turbulence at altitude. Pilots consider surrounding weather information rather than the cloud alone.
Where to look
Mountainous regions are classic locations, but atmospheric waves can also produce similar clouds elsewhere. Look for smooth, stacked lenses rather than fluffy heaps or an even blanket.
Frequently asked question
Is a lenticular cloud a UFO?
No. Its unusual shape is a recognizable atmospheric effect produced by wind and condensation.
Source and further reading
See the NOAA reference for additional scientific background.
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