Conclusion 4

It takes about 10 seconds to come into equilibrium with the airmass after falling through a wind shear. When calculating the drift, the extra distance is equivalent to spending about 6 seconds longer in the uppers than actually happens.

Example: Upper winds are 30 kts (51fps) and the skydiver spends 20 seconds in them. The freefall drift distance due to the uppers is (approx):

(20+6) x 51 = 1326ft

Finally look at the effect of wind shear. Make the uppers, say, 40kt, and the lower level winds zero. Neither ball instantly stops its drift when passing out of the upper winds. Indeed, it takes several seconds for the lateral drift to decay away. This means that the total drift is greater than is computed simply by multiplying upper windspeed by time spent in the uppers.