Answer:
This is a metaphor.
Explanation:
When you compare something to something else, without using "like" or "as", it is a metaphor. In this situation, the argument was so loud and angry, it was like a thunderstorm. Imagine with rain pelting down, and thunder and lightening. Big, loud, and scary.
A MacGuffin is that object in a film which is critical to the characters, but carries insignificant meaning for the audience.
A MacGuffin, a term introduced and widely used by Alfred Hitchcock is some element which drives the plot. The audience is not very concerned with the specifics of it.
An antagonist is the character who basically causes the problems in the story. They do not have to be a bad person, they just simply have to create the conflict for the protagonist, whether on purpose or accidentally.
Widow and Lonely!
As you can tell from the short context, she is trying to convince Vivien to console with her because she is lonely.