“It’ll be an incredibly sharp cutoff. There could literally be a 10-inch difference from northern to southern Cook County, or more. There’s going to be a sharp line between the haves and have-nots, but it’s still tough to say exactly where the line will be,” said Gino Izzi, a meteorologist with the weather service. “Somewhere over a relatively short distance, we’re looking at an 8- to 10-inch difference in snowfall.”