Training Guide in Surface Weather Observations - Multiple Choices

Figure 5-4. Advancing Layer (sky cover 4/8).
This is also indicated by the Sky Cover Evaluation table (the value, 4/8, corresponding to an angular
elevation of 90 degrees). If the leading edge reaches an angle of only 45 degrees above the western
horizon (see Figure 5-5), the Sky Cover Evaluation table shows the sky cover to be only 1/8.
Figure 5-5. Advancing Cloud Layer (sky cover 1/8)
Next, the layer from the west reaches a point 45 degrees above the eastern horizon (see Figure 5-6).
From the Sky Cover Evaluation table, sky cover is determined to be 7/8 (i.e., an angle of 135 degrees
above the western horizon).
5-6