A: This sort of thing happened to me as well. I have lived in this home for over four years and never experienced any issues. All of a sudden there was a lot of water leaking in and around the window during the storm.  I immediately associated the leak with the driving wind and rain that night. I believe the water tightness of the window was adequate for all conditions except this one weird storm. I was not eager therefore to begin dismantling the window as I was sure the leak was not going to happen again. That situation was over two years ago and no and I have not experienced another leak in this window since. I recommend checking the window to see if there are any outstanding issues and if not than I would just leave it for now.