What's not to love about 15:1? That means that the .01 QPF that Raleigh will get should blossom into .15 inches of snow! Of course you have to adjust that downwards because of mixing issues at the outset. And you might also have to adjust it downwards because of the inevitable dry slotting. And I read some graffiti at a bus stop warning that warm ground temps and sun angle could also cut down on accumulations. But those ratios are IN PLAY!