Uses radar and satellite data to determine current state of sky conditions Only uses COOPs, airport data, and weather balloon dataįorecasts are generated for 14 days in the future (Weather Underground only utilizes the first 10 days on the site)įorecasts are generated for 7 days into the future.Ī variety of inputs, including, but not limited to, ECMWF, GFS, and NAM Personal Weather Stations (quality-controlled to only include stations with accurate observations), COOPs, airport data, and weather balloon data. Temporal resolution (how often the forecast is updated)

Spatial resolution (how many forecasts within a given area)Ĥkm grid (one forecast every 4km)-36% more forecasts than NWS In a step to create an unprecedented level of transparency to our forecasting, we publish the recent accuracy of our forecasts for every US location alongside the accuracy of the NDFD forecasts. Only our unrivaled amount of local neighborhood weather data can generate forecasts for your front door.įor US locations we give users the option to switch to view the forecasts generated from the National Weather Service’s National Digital Forecast Database (NDFD).

BestForecast™ uses the most innovative forecast models available and cross-verifies their output with all of the localized data points.

Our ever-expanding network of 250,000+ personal weather stations is the largest of its kind and provides us with a unique ability to provide the most local forecasts based on actual weather data points.

All of our forecasts are generated from our proprietary forecasting system that leverages our vast amount of neighborhood weather data that we get from our community - we refer to the system as BestForecast™.

Weather underground history data