We've always liked Weather Underground for its no-nonsense, real-time weather info. Today they've released a new service called Full Screen Weather that mashes up Google Maps with weather data for nothing but maps and up-to-the-minute weather info.
(Click the image above for a closer look.)
Just point your browser to fullscreenweather.com and get browsing. By default the map displays temperatures as measured from stations across Weather Underground's extensive reporting areas, but you can also switch to Precipitation and Cloud views (you can even play back cloud or precipitation movement over time). In the bottom-left of the window you get an overview of current conditions and a four-day forecast, with links to more extensive forecasts on Weather Underground proper.
The site is clean, simple, lightweight, and ad-free — which is to say, pretty great.
Full Screen Weather [Weather Underground]