Interestingly enough, the time last year when it rained in the shelter was not a typhoon, just one of the regular, deluge rains of Japan. There was very little wind that night. The rain, and I mean "RAIN", came straight down, for eight hours. On the other hand, the few times that I've pitched a shelter in a typhoon (one time on purpose, with a homemade silnylon teepee in a park near my home, and another time way above treeline in a TarpTent Rainbow that had not been seam sealed, to name two times) I've only experienced the condensation being knocked off the fabric. The Rainbow experience taught me the importance of seam sealing... there was very little misting, but the seams leaked like sieves. The homemade teepee had no problems whatsoever, though I was using factory seconds silnylon from Noah Lamport. And another time, with a newly purchased TarpTent Squall 2 (I had been using the Squall 1 for quite some time by then) I got back from a day hike with my shelter pitched at a base camp just as a huge storm hit and my wife and I lay reading books while the rain pummeled the shelter. We didn't even experience light misting, though the fabric had condensation on it. This was the same shelter that four years later got rained in.
Japan gets tons of very hard rain, rain that I've never experienced anywhere I've lived or traveled in North America (Massachusetts, Maine, Oregon, Washington, New York, North and South California, South Carolina, British Columbia, Montreal, Nova Scotia, though I suspect South Carolina gets similar weather at times) or most of Europe (though the Alps sure had some wild weather!) Even Scotland and Norway, though very very wet and cold, didn't have that kind of rain. In the summer of 2008 it deluged here everyday, 24 hours for two months straight. Never had I seen so much lightning in my life! (albeit it was a freak summer, too)