Misting is less of an issue with tarps, but can still happen. In essence , if there is enough condensation to form on the canopy, and hard enough rain (or hail) to knock it off it can happen. Steeper sides on a tent /tipi can lessen the effect as well, since it is more likely to run off due to gravity. Tarps pitched off the ground and open ended will get less condensation, but in can happen given the right environmental conditions. I've never had it be what I would consider awful, and honestly in the times it has happened it has been extremely wet, and in fact wet enough that I suspect I would have had issues with whatever double wall / floored tent I could have been in as well. I've had double walled / floored tents leave me wet when the right conditions were in place before.
