Websites providing visual weather data
weather.us


If somebody is looking for free global ECMWF forecasts the above site provides a fairly complete set of links that provide information 10 days into the future. You can track the control member(which I believe is a deterministic forecast) and also the ensemble output.  In addition you can look at worldwide lightning detection sites as well as radar images of US and other selected countries. For followers of tropical meteorology  hurricane tracks of ECMWF are also available - ECMWF  cyclone tracks. 
The availability of free ECMWF forecasts comes via the courtesy of Jörg Kachelmann who owns the site.