I've been looking for a good operational WMS or WFS free service to access near-real time atmospheric data in QGIS, namely wind vectors. I haven't found anything good yet.
NOAA's NowCoast service provides a real(ish) time wind speed as a WMS layer.
Environment Canada offers a free public WMS / WFS / WCS server with hundreds of layers focused on numerical weather prediction models and observations data. It includes layers for winds for the whole world, along with several related products (e.g. winds at several altitudes, wind gusts, etc).
The server: http://geo.weather.gc.ca/geomet/ The documentation: http://www.ec.gc.ca/meteo-weather/default.asp?lang=En&n=C0D9B3D8-1
Hope this helps! -- Alex