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Wind deflection is greater when wind is stronger closer to the muzzle than the target. There's greater effect because the angular deviation may be the same, but due to the distance to the target, the same angle produces more deviation at the target. Deflection at the same wind velocity is less nearer the target.
Think about a 30-60-90 degree triangle on a sheet of paper. The shortest side is the target and the next shortest is the line of sight. The long-side (hypotenuse) is the (simplified) deflected bullet path caused by wind at a point along the line of sight.
If another short-side line is drawn closer to the "muzzle" the short side (deflection) becomes shorter. That represents the same wind velocity, but closer to the target.
That's why shooters should pay more attention to wind flags closer to the muzzle than to the target.
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