Seems like you've probably already left, but for anyone else looking to camp similarly:

Lots here have talked about site selection; pick one that's as best out of the wind as possible. But another hugely important thing to remember (that I didn't catch anyone else mentioning) in seriously windy conditions is to very thoroughly check for dead or even weakened-looking limbs and trees in the area. These things are always dangerous, but wind will bring them down no problem. Keep an eye out.

EDIT: And, of course, I missed it; OutandBack mentioned it. ;p