Used this tent in eastern Idaho in Sept '07. At the top of a mountain a huge thunderstorm hit just before dark. I had already set up the tent, but during the first of the storm I had to seek refuge in the mid-level trees because of the lightning. The bolts were hitting 100 yards from me. Then the hail, rain and wind came. The rain was the heaviest downpour that eastern Idaho had seen in ten years, and it lasted for 3 1/2 hours. The wind was at 30 mph for a while. After the lightning passed, I made it into the tent. There was a small problem trying to figure out how to get in without the rain coming in. I just did it quickly. After that I stayed completely dry the whole night. The bathtub design was crucial since the amount of rain caused a river of water under the tent between the floor and the ground tarp I had put down. It was like sleeping on a waterbed. I had also taken the precaution of sealing all of the seams of the tent before I ever used it,,,even though they had been sealed with tape during manufacture.