Weather Underground has partnered with AmbientWeather.com to create The Weather Exchange, the world's largest free personal weather station network.
The Weather Exchange is a free PC desktop application that accesses live weather data from personal weather station owners, schools, businesses and government agencies. Anyone with a personal weather station, PC, and internet connection can automatically report data to the free weather server. The Weather Exchange also provides up to the minute forecasts, radar, warnings, and detailed weather maps, keeping you instantly informed to any changes in the weather.
Data sent by any digital weather station running Ambient's Virtual Weather Station is processed, stored and displayed by the Wunderground.com website all free of charge to the user. Additional benefits include Ad Free Wunderground and weather email alerts.