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Franny's Feet - 2003 The Lonely Library Wonderful Woolies was released on: USA: 10 February 2007
If you mean above 20,000 feet, it's probably a cirrus cloud.
from 6500 to 60000 feet
Alto
several thousand feet deep
Alto
It was almost 60,000 feet high.
The cloud rose to over 60,000 feet in about ten minutes.
A Thunderstorm cloud is called cumulonimbus cloud. They can range in height from 30,000 feet to 70,000 feet into the atmosphere. The taller the cloud, the more power that has built up within it.
Cirrus clouds are found at about 16,500 feet in altitude. The cirrus cloud is very wispy and feather-like in appearance.
there above 15,000 feet up in the air