they have no precipitation and do not constitute an icing hazard. Severe or extreme turbulence is
often found in the anvil cirrus of thunderstorms.
Figure 2-16 Cirrus Clouds
Special Clouds with Extensive Vertical Development
is found at the low to middle cloud heights and their tops extend through the high cloud category.
Figure 2-17 shows cumulonimbus clouds.
Figure 2-17 Cumulonimbus Clouds
Atmospheric Mechanics of Winds, Clouds and Moisture, and Atmospheric Stability