- Unusual cloud patterns and lighting, with billows and cloudlets
- W033989Z
- Unusual cloud patterns and lighting. Low sunlight grazes thin Altocumulus clouds filled with a multitude of billows and small cloudlets. The cloud sheet thickens closer to the horizon and represents slow ascent of a layer of moist air ahead of a weak weather system. The waves (billows) ride up the slope of the advancing warm air wedge, breaking the cloud apart. An unrelated set of much larger waves form clear troughs across the view.
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