Weather
Underground is a commercial weather service, which provides real-time
weather information via the Internet. Weather Underground provides
weather reports for most major cities across the world on its website,
as well as local weather reports for newspapers and websites. Most of
its United States information comes from the National Weather Service,
as federal law specifies that information from that agency falls within
the public domain. The website is available in many languages, and
customers can access an ad-free version of the site with additional
features for an annual fee.