Word: cumulonimbus
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...Most dangerous are the low, dark nimbostratus (because of its poor visibility and the danger of icing) and the stormy thunderhead, cumulonimbus. Also to be avoided: the wavy, handsome billow cloud-which gives a very billowy ride...
...lower limits†: in middle latitudes the highest clouds are six or seven miles above sea level (because air gets no colder above that height); the lowest (except for fogs) are at about 2,000 ft. In thickness, a cloud may vary from a wafer (cirrus) to several miles (cumulonimbus...
General Yount's fledgling pilots had to learn that a cumulonimbus cloud should be regarded as a red traffic light of the air lanes, because it means rough air thunder storms, sometimes hail. But even after they memorized cloud forms until they could recite them in their sleep, they could not learn a proper respect for weather until they stuck their noses into trouble. That took time...