Question: 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?

<P0-S0> Surface weather observations are the fundamental data used for safety as well as climatological reasons to forecast weather and issue warnings worldwide. <P0-S1>  They can be taken manually, by a weather observer, by computer through the use of automated weather stations, or in a hybrid scheme using weather observers to augment the otherwise automated weather station. <P0-S2>  The ICAO defines the International Standard Atmosphere (ISA), which is the model of the standard variation of pressure, temperature, density, and viscosity with altitude in the Earth's atmosphere, and is used to reduce a station pressure to sea level pressure. <P0-S3>  Airport observations can be transmitted worldwide through the use of the METAR observing code. <P0-S4>  A thirty-year average of a location's weather observations is traditionally used to determine the station's climate. <P0-S5>  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. <SEP> <P1-S0> DUATS, or Direct User Access Terminal Service is a weather information and flight plan processing service contracted by the Federal Aviation Administration (FAA) for use by United States civil pilots and other authorized users. <P1-S1>  The DUAT Service is a telephone- and Internet-based system which allows the pilot to use a personal computer for access to a Federal Aviation Administration (FAA) database to obtain weather and aeronautical information and to file, amend, and cancel domestic IFR and VFR flight plans. <P1-S2>  The DUAT Service provides direct access to weather information via a National Airspace System (NAS) Data Interchange Network II (NADIN-II) interface to the Weather Message Switching Center Replacement (WMSCR) System and the Air traffic control (ATC) Facilities for filing flight plans. <P1-S3>  The pilot users can interface the DUAT Services via the FTS-2001 toll free telephone numbers or via an Internet Interface into the Contractor's Facility. <SEP> <P2-S0> The National Weather Service Duties Act of 2005 was a legislative proposal forwarded in April 2005 by United States Senator Rick Santorum (R-PA) to curtail perceived government competition with commercial weather services from the National Weather Service. <P2-S1>  Though the wording of the bill was generally considered unclear, the general consensus among observers was that its effect would be to eliminate public dissemination of National Weather Service data and forecasts except in case of severe weather alerts. <P2-S2>  The bill attracted no cosponsors in the Senate and eventually died in committee, and was roundly criticized by the general public for threatening to move taxpayer-funded data (currently made available for free) to commercial for-profit channels (i.e. behind a pay wall). <P2-S3>  The bill had very few supporters outside the commercial weather industry. <SEP> <P3-S0>  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. <P3-S1>  Its information comes from the National Weather Service (NWS), and over 250,000 personal weather stations (PWS). <P3-S2> Weather Underground is a commercial weather service providing real-time weather information via the Internet. <P3-S3>  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. <P3-S4>  Weather Underground is owned by The Weather Company, a subsidiary of IBM.