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 two or more meteorological towers; defining a location of said one or more target sites; calculating exposure at the two or more meteorological towers and at said one or more target sites; using a default wind flow model to predict a wind speed at each of the two or more meteorological towers based on the wind speed measured at a different one of said two or more meteorological towers and difference in exposure between the two or more meteorological towers and calculating an error in the predicted wind speeds for each of the two or more meteorological towers; altering the default wind flow model based on the calculated errors to derive a site-calibrated wind flow model that results in minimized errors in the predicted wind speeds for each of the two or more meteorological towers; and applying the site-calibrated wind flow model using the measured wind speed at each of the two or more meteorological towers and difference in exposure between each of the two or more meteorological towers and said one or more target sites to predict a wind speed for said one or more target sites.