Relative SPL ΔL calculated at f = 500 Hz for the receiver at height z_R = 2 m and x_R upwind (−x) and downwind (+x) with U_ref = 8 m/s at z_ref = 80 m for (a) different wind shear exponents α with the source at z_S = 80 m and a hard ground with no turbulence in the atmosphere, (b) α = 0.3 and with the grass ground in the summer and different source heights with no turbulence in the atmosphere, and (c) α = 0.3 with the source at z_S = 80 m and different ground conditions and including turbulence in the atmosphere. The shaded area shows where the implemented WAPE-MM is not validated (solid line with no turbulence, dashed line with low turbulence and dotted line with strong turbulence).