What are literary techniques in "The Storm" by Kate Chopin?

Kate Chopin uses colloquial speech to aid in the characterization of Bobinôt and Bibi, seen in Bibi's response to his father's suggestion that Calixta had Sylvie helping her: "No; she ent got Sylvie. Sylvie was helpin' her yistiday."
Chopin also uses varying settings as she moves between Bobinôt and Bibi, and Calixta and Alcée. The story opens with father and son at Friedheimer's store, and then the narrative moves to Bobinôt and Calixta's home.
Imagery is another technique Chopin uses in "The Storm" to describe the weather and the physical attraction of Calixta and Alcée, as seen in this line: "The rain was coming down in sheets obscuring the view of far-off cabins and enveloping the distant wood in a gray mist."
Chopin uses a simile in her physical characterization of Calixta: "Her lips were as red and moist as pomegranate seed."
Though Bobinôt has done nothing wrong in staying at the store during the storm, he fears that he has upset Calixta and approaches her carefully when he returns, rehearsing "explanations and apologies which he had been composing all along the way."  This is situational irony, given that Calixta has just had a sexual liaison with Alcée during the storm.