EFFECTIVE DOWNWIND DIRECTION. To determine the effective downwind direction (EDD), you must determine the sector angle formed between the radial lines GZ-CT and GZ-2/3 S and ground zero. If the angle is 40 degrees or greater, EDD is obtained by bisecting the angle. If the angle is less than 40 degrees,

Figure 6-9-4.-Wind vector plot with cloud and stem radial lines.

Figure 6-9-5.-Example of wind vectors extending beyond radials and angle expansion.

bisect the angle but then expand the angle to 40 degrees by drawing two additional radials. See figure 6-9-6. THE ORIENTATION OF THE BISECTING LINE IS THE EFFECTIVE DOWNWIND DIRECTION.

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