possible to set wind variation (FS2004)?

In the advanced weather dialog in FS2004, is it possible to set not only wind direction, but also wind direction variation?eg:direction: 240 degreesvariation: 10 degreesI don't remember if this was possible in FS2002, but I can't see it in FS2004.I have found it in the weather themes, so the value is definitely used by FS2004...Cheers, Christian