With all the whiteness mentioned repeatedly throughout the story, "The Storm" practically reaches Moby-Dick levels. White usually symbolizes purity or chastity, but this story twists it around to represent sexual desire and longing.
Consider all the times white is mentioned in the story, usually in relation to Calixta:
While this whiteness in literature would traditionally refer to a body that the male character couldn't access, that purity is transformed into sexuality here. The "flame" of Calixta's "passion" is "white"; her body in all its ecstasy is "like a creamy lily." In this story, the color white might almost be better understood as red-hot. It means giving in, not holding back.