The primary imagery in Emerson's poem is clearly seen in the beginning with these lines:
Announced by all the trumpets of the sky, Arrives the snow, and, driving o'er the fields,
Seems nowhere to alight: the whited air
Hides hills and woods, the river, and the heaven,
And veils the farm-house at the garden's end.
The imagery stimulates the senses that the weather is changing and that the looming snow-storm is about to begin. It generally describes how the said weather is about to take place by giving the reader a clear picture how the environment transitions.
