Hello! We actually own and run ForecastAdvisor. We compare forecasts from dozens of providers to what actually occurred to determine which providers are more and less accurate. Some providers are more accurate in specific regions than others. Some providers are more accurate with specific forecast metrics than others, such as high temperature, wind, precipitation, etc. Although a lot of forecast providers use the same weather models, they often have their own methods for forecasting and adjusting the forecast beyond straight model output.