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Take a look at the night light map of the USA and I think you will see why its so hard to define.
There is a sharp line dividing several states in the west.
Personally I think of the Midwest as the medium intensity lighting between the Dark areas in the east and west.
http://www.nasa.gov/sites/default/files/images/712129main_8247975848_88635d38a1_o.jpg
There is a sharp line dividing several states in the west.
Personally I think of the Midwest as the medium intensity lighting between the Dark areas in the east and west.
http://www.nasa.gov/sites/default/files/images/712129main_8247975848_88635d38a1_o.jpg