Kinda interesting that you bring this up, as Mrs. doc enjoys the TV series CSI, which is set in Vegas.......now both she and I have spent more than a little time in Vegas, and know that it rains probably no more than three times a year there, however, when they do a night time outdoor scene, it seems to be raining a good percentage of the time......I told her that it is likely easier to control the night scenes for creative reasons by inserting the rain.......unrealistic as it may seem in real life to someone that lives there......
doc