A cloud of a class characterized by thin white filaments or narrow bands and a composition of ice crystals; of high altitude, about 20,000 - 40,000 feet is known as?

The correct identification of the cloud type as cirrus is based on its distinctive characteristics. Cirrus clouds are typically found at high altitudes, generally ranging from about 20,000 to 40,000 feet. They are characterized by their thin, wispy appearance, resembling delicate ice crystals or feathery strands.

These clouds often indicate that the atmosphere is relatively dry, and their presence can suggest that a change in weather might be on the horizon, particularly warmer or more unsettled weather as they can signal that a warm front is approaching. The light white filaments of cirrus clouds are primarily composed of ice crystals due to the cold temperatures at such altitudes.

Understanding the nature of cirrus clouds helps meteorologists predict weather patterns, as their formation can indicate changes in atmospheric pressure and temperature. This knowledge is vital for both aviation and general weather forecasting.