Snow Forecast.com - Snow-Forecast.com - Free service providing daily snow forecast and temperature maps for ski and mountaineering areas around the world. Features global overviews for all the continents and detailed local forecasts for many popular ski locations.
Center for Ocean, Land and Atmosphere - Center for Ocean, Land, and Atmosphere - Worldwide coverage as well as North America. Great tutorials to assist with interpreting the coloured graphical information.
Wunderground.com - Weather Underground is a commercial weather service that provides real-time weather information via the Internet. Weather Underground provides weather reports for most major cities across the world on its Web site, as well as local weather reports for newspapers and Web sites.