1. A method of predicting wind speed at one or more target sites comprising the steps of: measuring a wind speed and a direction at one or more meteorological towers; defining a location of said one or more target sites; calculating exposure at the one or more meteorological towers; calculating terrain complexity; selecting a wind flow model based on the terrain complexity wherein the wind flow model relates change in wind speed to change in exposure; calculating exposure at said one or more target sites; calculating a difference in exposure between the one or more meteorological towers and said one or more target sites; and applying the wind flow model using the wind speed at the one or more meteorological towers and the difference in exposure between the one or more meteorological towers and said one or more target sites to predict a wind speed for said one or more target sites.