- Clouds caused by a hidden source, a mountain upwind
![Clouds caused by a hidden source, a mountain upwind](http://www.skyartstock.com/peas/W000092Z-SKYART.jpg)
- W000092Z
- Clouds caused by a hidden source influence. Mountains are nowhere in sight, but this cloud has formed under their influence upwind. It consists of very high Altocumulus bands forming where a streak of moisture is subjected to gentle lift in a strong flow aloft, within a lee wave pattern. The flow is along the bands.
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