A thin layer, small amount (esp in phr skiff/skift of snow = a light fall of snow).
1834 (in 1956 Eliason Tarheel Talk 294) last night we had a little skift of snow. 1904 Kephart Notebooks 2:600 A thin skift of clouds. 1939 Hall Coll. Cataloochee NC We just got out on top, and there was a little skift of snow a fallin’. (Will Palmer) ibid. Cataloochee NC They was a little skiff of snow, and that was how come to see their sign (Steve Woody) 1953 Hall Coll. Plott Creek NC My grandmother has told me that when they first were back there, and they’d be snow or anything, a skift of snow around the pens, they’d be bears and wolf tracks all about there trying to get the stock from the barn. (John Plott) 1966 DARE = the first thin ice that forms over the surface of a pond (Brunsville NC); There’s just a skiff of ice (Spruce Pine NC).
[OED skiff “a slight sketch, trace, touch, etc.” chiefly Scot; cf CUD/HT skift “a light shower”]
Sunday morning we awoke to the tiniest skiff of snow. I’m hoping the skiff helped prime the pump for a big snow.