what single effect does Edgar Allan Poe create even in the first sentence of the story?

Poe creates a sense of foreboding.

"DURING the whole of a dull, dark, and soundless day in the autumn of the year, when the clouds hung oppressively low in the heavens, I had been passing alone, on horseback, through a singularly dreary tract of country, and at length found myself, as the shades of the evening drew on, within view of the melancholy House of Usher."