First of all, thank you very much for your reply. Yes, I am taking a look at the European Wind Atlas, and I saw that the methodology they describe for correcting the logarithmic wind profile due to stability issues is, in short, including the extra term -4.7*(Z/L)(assuming stability) in the logarithmic equation. So, my question is if WAsP does exactly this, but according to you and some articles I've read, WAsP does what you say. What I am investigating is: Computing the geostrophic wind through a mesoscale model (WRF, in my case), I will use the logarithmic wind profile (including the term -4.7*(Z/L)) to make the wind atlas using MATLAB routines. The friction velocity will be computed using the Simplified Geostrophic Drag Law. I want to check if applying this correction the results are better than the methodology WAsP follows. You think this is logic???? Thank you very much