The raw data from the GFS model really is a waste of time without the error correcting measures that the NWS has developed over decades. A much more honest weather forecast would be GFS corrected in the near term with NWS adjustments. While the ECMWF model is pretty good near term, it also suffers from a wide standard deviation further out, even to the point of having wild temperature forecast swings intraday 10 to 15 days out. The point here is that the models are so deeply flawed beyond a 7 to 10 day horizon that they are mostly worthless, yet this extended horizon is what you charge for! Windy seems great for monitoring hurricanes and getting accurate rainfall forecasts, but beyond that, at least in the US, the NWS is a good as anything out there. Signed, "not a meteorologist"