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Figure 1-4.Turbulent lift.
Cloud  Species

Aerographers Mate, Module 01-Surface Weather Observations
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to the air mass through evaporation. Moisture may evaporate into an air mass from precipitation falling through the air mass and by evaporation from bodies of water.  These  processes  generally  are  only  significant  in cloud and fog formation within several hundred feet of the  earth’s  surface. You will study these cloud formation mechanisms in  detail  in  the  later  training  modules. Cloud  Genera Clouds  are  further  identified  with  more  specific names that are commonly referred to as cloud type, but are more accurately termed cloud genera. The basis for the cloud genera identification is the level at which the cloud forms, as well as the way the cloud formed. Cloud Etage With respect to clouds, the atmosphere is broken down into three layers or etages. In the middle latitudes or temperate region, the low-etage is from the surface to 6,500 feet; the mid-etage, from 6,500 feet to 23,000 feet; and the high-etage, from 16,500 feet up to near 45,000 feet (fig. 1-6). The limits of the etages are generally lower in the polar regions (mid-etage from 6,500  to  13,000  feet  and  high-etage  from  10,000  to 25,000 feet), and higher in the tropics (mid-etage from Figure 1-6.—Temperate Region cloud genera—cloud forms in the three etages. 1-6







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