I lived there for a year in high school. Nice city. Even nicer region of the country - I like Michigan.

If you get much closer to Lake Michigan you'll get huge weather effects, but not a whole lot of risk there. I suppose the Grand River could flood, but a lot depends on where you live with respect to the river, which runs pretty much the width of Michigan.

The economy there is probably the biggest risk you'll run. The whole state is getting hit hard by the automotive industries slow death. My niece is trying to sell her house there. Not much luck from what I hear.