I'm suprised nobody has posted about this yet.
Anyways, from what I have seen it is one confusing DOT command to use. I was screwing around offline and came up with this.
The full dot command is .wind (minimum altitude of the wind) (course) (speed up to 127mph) (updraft speed from 0-127mph).
.wind 12000 225 30 45
That is wind starting at 12,000 feet of altitude (and goes up to a hardcoded limit of 30,000 feet that I haven't found if I can change or not), is blowing southwest at a speed of 30mph and has an updraft of 45 mph.
I did a "stupid pet trick" and set a headwind of full 127mph at ground level and took a B26 up. I actually never left the airport. I just went straight up. Hell, if I rode the stall at 100mph I could go backwards.
Even more interesting is the panzer. (bug) Aparently it really IS very un-areodynamic. I had come down from the v56 hill to shell a26...then decided to play with the wind...and promptly was blow back UP the hill. I only set a 20mph wind, but it was enough to get my panzer up to 90mph in reverse (then I fishtailed and flipped).
Hans.