The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Hong Kong Observatory:
'MyWorldWeather' is a mobile version of the WWIS. It is equipped with location-based technology to detect the location where the user is located and to provide users with official city weather forecast automatically.The World Weather Information Service (WWIS) website is the first and the only one global website presenting OFFICIAL weather observations, weather forecasts and climatological information for selected cities provided by National Meteorological and Hydrological Services (NMHSs) worldwide. WWIS aims to provide authoritative and reliable weather information of NMHSs around the world to all internet users and media. The WWIS website was developed and maintained by the Hong Kong Observatory (HKO) on behalf of the World Meteorological Organization (WMO). By 2012, around 130 members supply official weather forecasts for over 1,600 cities on the WWIS.