Weather Underground currently uses a network of 30,000 personal weather stations across the USA to provide accurate local forecasts. Now the service will ask users to report and verify weather events through a simple interface, and other users can view conditions that were observed within ten miles of their location.
The Weather Underground weather map -- AKA "WunderMap" -- has always featured a number of layers that can be turned on or off, including precipitation, temperature, wind, radar, cloud cover and more. The crowdsourced information now appears on a separate layer.
The app also adds a landscape mode, more interactive graphs showing data trends, history and forecasts, more webcams, and access to weather-related videos. As before, the Weather Underground app is available for free from the App Store.