FWIW. From Joe Bastardi...
"the axis of the heaviest snow looks like you take I-70 from the plains to BWI and then just extend it east. In this band about 150 miles wide is 6-12 inches of snow which is 10 to 1 south of the axis and up to 20 to 1 north of it. Some 15-inch lollipops will occur. "