- Clouds arranged in parallel bands by a lee wave pattern
![Clouds arranged in parallel bands by a lee wave pattern](http://www.skyartstock.com/peas/W941365Z-SKYART.jpg)
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- Altocumulus clouds arranged in parallel bands by a lee wave pattern in the atmosphere downwind of hills. Each band looks like a typical lenticular element which gives the impression that the flow is along its length. However, this is an illusion and the actual flow rises and sinks in short up-down ripples as air travels through and across the bands. The bands are compressed in the view by distance.
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