6 (3) Wind Velocity. There are two methods used to determine wind velocity: observation
7 and flag. The flag method is used as a training tool to learn the observation method. This
8 method teaches Marines to relate the effect a given wind condition has on the natural
9 surroundings in order to develop the base of knowledge used during the observation method.
10 The observation method is the primary method used during a tactical situation.
11 (a) Observation Method. The observation method is the primary method used to
12 determine wind velocity and direction in a tactical situation. The following are guidelines
13 used during the observation method:
14 • Under 3 miles per hour (mph) the wind can hardly be felt on the face. The
15 presence of a slight wind can be detected by drifting smoke.
16 • 3-5 mph winds can be felt lightly on the face.
17 • 5-8 mph winds keep leaves in a constant motion.
18 • 8-12 mph winds raise dust and loose paper.
19 • 12-15 mph winds cause small trees to sway.
20 • 20-25 mph winds cause large trees to sway.
21 (b) Flag Method. The flag method is the primary method used on the KD range.
22 Perform the following steps to determine wind velocity in miles per hour:
23 • Determine the angle created between the flag pole and the flag in degrees.
24 • Divide the angle by four to determine wind velocity in miles per hour. See figure
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