Originally Posted by
iwebslinger
How hard does it have to be blowing for planes not to take off?
In which direction?
Most of the time, cross-winds are the problem. cblaisd pretty much said it all. Usually, runways are designed, based on past wind data, to be open at least 95% of the time, due to crosswinds.
If you get heavy tailwinds and the runway is not long enough for a particular plane going to a particular place, then the plane won't take off. (the same is true for landings)
Not sure if there's a limit for headwinds, but I imagine there must be.