Genesis 8:2

The word stopped not only means to end but also to close.Genesis 8:2indicates that the fountains of the deep and the windows of heaven were closed at this point. This consistent with the earlier suggestion the Earth atmosphere was the “windows of heaven” opened by water from the fountains of the deep ripping through it. Once eruption of subterranean water ended the whole collapsed back closing the “windows of heaven.” The shock wave from the closer may have been the wind mentioned in verse one. Not that this resulted in the rain ending. This would have occurred after forty days.