- This chinook arch cloud began as supercooled water droplets
- W881128F
- A view north along the edge of a chinook arch cloud. The main sheet begins at left as supercooled water droplets in high Altocumulus which freezes into Altostratus to the right. Farther away, a darker cloud is a lower Altocumulus layer in the same wave but a little slower to freeze.
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