I was looking for a wind WMS but couldn't find. I wanted a wind WMS for Europe and Africa. Does anyone know about any?
Since you said "raster graphics", you could use a "winds aloft" chart (for the ground level - "SFC".
The useful part about these is that they'll provide predictions, and they're gridded.
The less useful part is that they're rasters. The same information can be obtained (at much better resolution) in GRIB (gridded binary). One source is http://om.yr.no/verdata/ - the website requires Norwegian, or guesswork, to figure out what to download.