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