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Note that the possible height of cloud varies with location and airmass, so the highest cloud can occur in the tropics, the lower heights (with cirrus possible at 10,000 ft or 3500 m) in polar regions.
Altocumulus castellanus cloud. Altocumulus Castellanus (ACCAS) is named for its tower-like projections that billow upwards from the base of the cloud. The base of the cloud can form as low as 2,000 metres (6,500 feet), or as high as 6,000 metres (20,000 feet), or 3296 Nm. They are very similar to cumulus congestus clouds, but at a higher level. Castellanus clouds are evidence of mid-atmospheric instability and a high mid-altitude lapse rate.