| 1. | AC = altocumulus 140 = 14, 000 ft . Closest I can find.
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| 2. | All cirriform clouds are classified as high and therefore constitute a single cloud genus altocumulus.
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| 3. | Altocumulus Castellanus clouds are typically accompanied by moderate turbulence as well as potential icing conditions.
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| 4. | For these reasons, flight through Altocumulus Castellanus clouds is often best avoided by aircraft.
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| 5. | The images are probably examples of either Altocumulus clouds, Cirrocumulus clouds, or Stratocumulus clouds.
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| 6. | Altocumulus and Altostratus are the main cloud types found in the middle levels of the troposphere.
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| 7. | Called altocumulus castellanus, these clouds are an indication that middle layers of the atmosphere are unstable.
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| 8. | Altocumulus clouds, then, are cumulus clouds riding higher in the air than typical cumulus clouds.
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| 9. | A circular fall-streak hole occasionally forms in a thin layer of supercooled altocumulus or cirrocumulus.
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| 10. | Tufted altocumulus has a little more instability, and its detached heaps have a distinct cumuliform structure.
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