A
Dashes are where you would pause.
Therefor you would say, "The storm seems to be over (slight pause) (thinking, no, wait, it isn't) no, the sky is darkening again."
This is an example of a simile, a comparison between two things using the words "like" or "as." "Gloomy as the night" is the simile here, since his sadness is being compared to nighttime.
Answer:
full anticipation is the answer