Re: Why is wind a problem
You just have to remember that rockets are very tall, and very thin. And most of the stuff you control them with is right at the bottom. It's hard enough to get them to go in a straight line anyway, without adding even more factors that make them unstable. Balance a pencil on its end on your finger, try and hold that upright. Now blow on it...
Winds in the upper atmosphere can regularly hit over 100 mph as well, even on calm days at surface level. This is why trans-Atlantic flight times might vary by over an hour (if the jetstream is going really fast). That's a lot of force exerted on a rocket, which it has to correct for. Although in this case it was apparently low altitude wind.