Nominal Wind Load

W = \frac{1}{2} \cdot ρ \cdot v_{mean}^{2} (z) \cdot G (z) \cdot c_{p, mean}

ρ	Density of air
v_mean	Average inlet velocity
G(z)	Gust factor depending on altitude
c_p,mean	Time-averaged pressure coefficient

Do you have any questions?