I'll try to explain. If one gets .4-.7 with about 1:10 ratios only and with a 9–10-hour window then it's about 4-7" of snow. If one has everything going for them, such as ratios 13:1 with the best omega banding, elevation, then the roof would be about a 10-12". Generally, that's what we have here. It's not going to be a widespread situation.