| Quote #1
The leaves were so still that even Bibi thought it was going to rain. Bobinôt, who was accustomed to converse on terms of perfect equality with his little son, called the child's attention to certain sombre clouds that were rolling with sinister intention from the west, accompanied by a sullen, threatening roar. (1.1)
The description of the storm sure sounds ominous. It's "still," "somber," "sinister," "sullen," and "threatening." While Bibi's a smart kid, the fact that even a four-year-old can tell that bad weather is on its way means it must be pretty bad indeed.
| Quote #2
Calixta, at home, felt no uneasiness for their safety. She sat at a side window sewing furiously on a sewing machine. She was greatly occupied and did not notice the approaching storm. (2.1)
Despite the fact that even Bibi notices the storm approaching, Calixta is totally "occupied" and caught up in what she's doing, "sewing furiously." She's so focused on accomplishing her housewifely duties that she doesn't notice the bad weather that lies ahead, let alone suspect the other storm that's about to rock her world.
| Quote #3
She stood there with Bobinôt's coat in her hands, and the big rain drops began to fall. (2.2)
When the storm begins to rage in earnest, Calixta is at home alone. Instead of her husband there to rely on and console her, all she has is his "coat." It's an empty shell that reminds her of him and reflects his shape, but it can't do anything to help her when "the big rain drops beg[i]n to fall."