Hi Morten, First of all thanks for you answer. In this particular case we tried not to estimate the extreme winds, since the extension of data is inappropriate, but is sufficient to evaluate the wind shear, flow inclination and turbulence intensity. We are using WACA 2 but since the series is less than two years OEWC cannot be calculated. So, in this case is the use the REWC files computed from NCEP/NCAR reanalysis data, and made available by RISO; a reasonable approach? Or is there a standard REWC just to evaluate the abovementioned features? Thanks in advance. Best regards, VareKey