I came up with this scenario because I wanted a pretext for putting a desert--or some area hostile to human life--in a place where there probably shouldn't be one. I think the region would realistically get somewhere between forty and sixty inches of rain per year, so I doubt that a dust bowl or desertification could really occur.
Can anyone please tell me what might actually happen to those lands--or at least what I could look up to work it out?
EDIT: Question answered. Thanks, everyone!