Final answer:
The technique used in Poe's The Fall of the House of Usher is symbolism, where inclement weather represents the narrator's feelings surrounding his sister's death.
Step-by-step explanation:
The technique used in Poe's The Fall of the House of Usher where inclement weather is used to represent the narrator's feelings surrounding his sister's death is symbolism. Symbolism is a literary device where an object, person, or situation is used to represent a deeper meaning or concept.
In this case, the inclement weather, such as the stormy atmosphere and the dark and gloomy setting, symbolize the narrator's sense of despair, grief, and impending doom. The weather mirrors the narrator's emotional state and adds to the overall atmosphere of melancholy and tension in the story.
Learn more about Symbolism in literature