Taking the above advice, I asked the guys who make the yurt and this is what they said:
1. If possible, set up the yurt so that the door is not facing into the wind. Keep in mind that even a fully set up yurt can be lifted and rotated with enough people.
2. Make sure to keep the door flap and dome flap are closed, with all ties securely tied. In high winds, I recommend staking the dome flap ties down with individual stakes, as opposed to tying to the structure itself.
3. Make sure the drawstring in the roof is pulled tight. Pull down on the roof edge to make sure it snugly against the wall.
For most windy situations, the tips above will serve you well. If you feel more support is needed you can also:
1. Hook bungee cords around the perimeter of the roof every few feet, and stake them to the ground. The elastic nature of the cords "anchors" your yurt even more firmly to the ground in addition to its own weight.
2. Use zip ties or any other strong tie to tie the roof rafters to the nearest intersection in the lattice wall.
Sounds an awful lot like what you suggested, Bob! Thanks for your help, I really appreciate it!!