20,000 AGL 6,500 AGL Low clouds Middle clouds High clouds Nimbostratus Altocumulus Cirrostratus Cirrocumulus Cirrus Altostratus Stratus Stratocumulus Cumulus Cumulonimbus Clouds with vertical development $^{ }$  $^{ }$I $^{N}$  D W Figure 5-6. Cloud diagram. Figure 5-7. Turbulence created by manmade items. 5-6