What is the name of a commercial weather service that provides real-time weather information reported by personal weather stations that have access to this international website?
Surface weather observation:  Personal weather stations taking automated observations can transmit their data to the United States mesonet through the Citizen Weather Observer Program (CWOP), the UK Met Office through their Weather Observations Website (WOW), or internationally through the Weather Underground Internet site. Weather Underground (weather service): Weather Underground is a commercial weather service providing real-time weather information via the Internet.
Weather Underground