Training Guide in Surface Weather Observations - Multiple Choices
Training Guide in Surface Weather Observations - Multiple Choices
Training Guide in Surface Weather Observations - Multiple Choices
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Figure 5-10. <strong>Surface</strong>-base Layer Surround<strong>in</strong>g Station (sky hidden 4/8).<br />
5.2.2 Sky Cover with <strong>Multiple</strong> Layers<br />
The follow<strong>in</strong>g guides can be used to determ<strong>in</strong>e if multiple layers are present:<br />
a. If a ceil<strong>in</strong>g light is available, observe whether or not spots are visible at several different levels.<br />
Several well def<strong>in</strong>ed spots separated by relatively clear spaces <strong>in</strong>dicate multiple cloud layers (see<br />
Figure 5-11).<br />
b. If multiple layers are suspected, try to detect differences <strong>in</strong> direction of movement of various<br />
portions of the cloud layers. Although the absence of such differences <strong>in</strong> movement does not<br />
necessarily mean only one layer is present (s<strong>in</strong>ce the apparent cloud direction may be the same<br />
at several heights), this guide is usually reliable if the differences <strong>in</strong> height are great.<br />
c. Differences <strong>in</strong> color<strong>in</strong>g and shad<strong>in</strong>g are helpful <strong>in</strong> dist<strong>in</strong>guish<strong>in</strong>g layers. In general, lower layers<br />
tend to be darker.<br />
d. The types of clouds are also helpful <strong>in</strong> dist<strong>in</strong>guish<strong>in</strong>g multiple layers dur<strong>in</strong>g daylight.<br />
5-10