Training Guide in Surface Weather Observations - Multiple Choices

Figure 5-6. Advancing Cloud Layer (sky cover 7/8).
Layers completely surrounding the station and extending to the horizon comprise another group of
idealized cases. (Imagine this layer as a doughnut whose outer circumference rests on the horizon and
whose inner circumference coincides with the boundaries of the cloud overhead - your station is in a
hole.) Now, if the outer perimeter of the cloud layer rests on the horizon and the inner perimeter
approaches the zenith, the sky cover is more than 7/8 but less than 8/8. Since an overcast sky condition
cannot be anything less than 8/8 total sky cover, this sky condition is classified as broken (see Figure 5-
7).
Figure 5-7. Layer Surrounding Station (sky cover >7/8 but