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Franny's Feet - 2003 The Lonely Library Wonderful Woolies was released on: USA: 10 February 2007
from 6500 to 60000 feet
Alto
If you mean above 20,000 feet, it's probably a cirrus cloud.
several thousand feet deep
Alto
It was almost 60,000 feet high.
The type of cloud that typically forms between 6,500 feet and 18,000 feet in the atmosphere is classified as a mid-level cloud. These clouds are generally composed of water droplets and can include types such as altostratus and altocumulus. They often appear gray or white and can cover the sky partially or completely, sometimes leading to precipitation.
The cloud rose to over 60,000 feet in about ten minutes.
it is from the midle level, and brings rain and thunder.
A Vertical Development Cloud, or a Vertical Growth Cloud.