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DETERMINING THE WIND FIELD
Determining  Accurate  Wind  Speed

Aerographers Mate 1 & C
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Figure 6-4.-Typical fetch areas. Location of Fetch bounded by coastlines, frontal zones or a change in isobars. In cases where the curvature of the isobars is In all cases, the first step toward a wave forecast is large, it is a good practice to use more than one fetch locating a fetch. A fetch is an area of the sea surface area, as shown in figure 6-4(B). over which a wind with a constant direction and speed is blowing. Figure 6-4 shows some typical fetch areas. Although  some  semipermanent  pressure  systems The  ideal  fetch  over  an  open  ocean  is  rectangular have stationary fetch areas, and some storms may move shaped, with winds that are constant in both speed and in such a manner that the fetch is practically stationary, direction. As shown in figure 6-4, most fetch areas are there are also many moving fetch areas. Figure 6-5 Figure 6-5.-Examples of moving fetches. 6-7







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