It's really, err, "interesting" doing an event in high winds. Chris and I did an Evo school in DC where it was 40F all day (or lower) and the winds were constant at 25MPH and gusting to 45MPH at times. We watched the entire course blow over at least three times.
In the Phase 2 there's a feature where you have a pretty long pull into a *tight* left hand 90 degree corner that has an exit chute that's also narrow. I flew up the hill and started to brake, all the time watching my track out cone and having the apex in my periphery. Next thing I know I'm off the brakes, on the brakes, turning a little more, and slide the car around the corner. My instructor, Sam Strano, says "what the hell was that???" I say "uh, I'm not really sure...I've done that feature about a dozen times now with no trouble, but something felt very strange that time." We shake it off and not worry about it and move on. Little later when I'm out of the car and changing workers the guy who was working that corner comes up to me and says "hey, what was it like driving through there and having your apex cone and all the cones around it shift about three feet inside?" WHAT? Apparently they had all just remained upright but slid inward relative to each other several feet due to wind. All *while* I was braking for the turn.
Talk about adding a new element to autocross. I don't recommend running events if the wind is gonna be that bad. It just isn't worth it.
--Donnie