In moderately strong winds, how far downwind of an obstacle is turbulence typically found?

In moderately strong winds, turbulence is typically found at a distance of 10-20 times the height of the obstacle. This is based on aerodynamic principles that describe how wind flows around and behind obstructions. When wind encounters an obstacle, it creates a flow pattern that leads to turbulent air on the downwind side. The turbulence zone extends outwards from the obstacle, and the distance from the base of the obstacle to the point where significant turbulence is present can be estimated using this multiplier.

The reason that this range (10-20 times the height) is suggested over other distances is because it provides a balance between immediate turbulence close to the obstacle and the diminishing effects of that turbulence as the distance increases. In stronger winds, turbulence can extend farther, while in lighter winds, the turbulence may be less pronounced and may not extend as far. Therefore, understanding that turbulence can linger at a distance of 10-20 times the height of the obstacle helps skydivers plan their approach and landing patterns more safely and effectively, accounting for the influence of wind on their descent.