First, I've seen people use Inflatable Bouncey House without tying them down with proper ropes and tied to objects that do not move (e.g. steel pole in a fence)...not tied down to a stake in the ground. Also, it only takes a small breeze (not a windy storm) to lift the Inflatable Bouncey House off the ground because of the tunnel pockets built inside them and the fact that they are bouncing a little off the ground. Heck, I remember one year in my backyard (it's a big yard)...a wind gust came out of nowhere on a sunny calm day. The wind gust lifted up my children's trampoline that was staked down at the end of the yard (about 56 meters away from the patio attached to my house) and threw it into the air where it slammed on top of the patio furniture. Luckily, the kids were inside the house (not outside playing on the trampoline) but I myself was outside and manage to jump off the patio porch when I saw it coming my way like a heat-seeking missile...it crushed two patio chairs and the wooden patio table...sending one of the legs from the patio table flying through the air like shrapnel from an explosion. wrbtrader