Thoreau writes in his journal:
The snow is fine: and drives low; is composed of granulated masses one sixteenth to one twentieth of an inch in diameter. Not in flakes at all. I think it is not those large-flaked snow-storms that are the worst for the traveller, or the deepest.
It would seem as if the more odd and whimsical the conceit, the more credible to the mass. They require a surprising truth, though they may well be surprised at any truth . . .
Sometimes, when I go forth at 2 P.M., there is scarcely a cloud in the sky, but soon one will appear in the west and steadily advance and expand itself, and so change the whole character of the afternoon and of my thoughts. The history of the sky for that afternoon will be but the development of that cloud . . .