- A complex pattern of criss-cross waves in cloud billows
- W030748P
- Criss-cross waves in cloud billows. A complex pattern of waves criss-crosses through an Altocumulus patch. Assuming that the cloud is all at the same level, it is possible that one wave train grazes the underside while another moves across the top of the cloud from another direction, although they can occur together at the same altitude.
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