Do it!: Classic Conundrums

Susie Summers owns a cottage in Vermont which has an A-shaped roof. One side of the roof faces north and the other side faces south. The prevailing winds from the north are usually quite strong. The strange thing is that the stronger the north wind blows, the stronger the resulting updraft on the south side of the roof. Therefore, if a rooster was to lay an egg on the peak of the roof during a strong northerthly wind, on which side should the egg fall most of the time?