A little info on the wind / weather sites. Most if not all use a variety of data sources, weather stations. NOAA uses their own and other gov't sources. Others, such as weather underground (wunderground) use a lot of their own (private individuals backyard stations) plus other sources (gov't, private, etc.). They all then run this data through a computer weather algorithm (weather modeling program). So two things are most important. First, how many accurate data points (weather stations) you use and second how good your prediction model is. Some are much better than others. The modeling is updated as improvements are learned. So do your own experiment and compare several of them for a few months and pick the one that's most accurate. Generally speaking a site that specializes in wind prediction is going to be better because they use as many wind data sites as they can from a variety of available sources, and they are always looking for the best wind prediction model. They can update/improve their service a lot quicker than NOAA can (NOAA is gov't, need I say more?).