The first step in the simulation process, wind climate classification, consists of classifying the wind regimes such as to produce a climate state database. The NCAR/NCEP reanalysis database, which covers the entire globe with a 2.5° resolution, is included in Anemoscope. For each database grid point, or climatic station, the climatic states are defined and characterized by their frequency of occurrence. This information is necessary to initialize the mesoscale model.