For the general population, if you forecast 3-6 and end up with 3, most people are happy because they got less snow. If you end up with 7 or 8, they don't really know the difference because 6" affects them the same as 7 or 8, basically. I think 4-7 is a good range in a setup like this- for my back yard, (even though I know I am getting 12).