A boy watches a thunderstorm from his window while something just as violent happens inside his home. The poem blurs the two. Storm clouds become grey wolves, and every crash of thunder gets tangled up with the sound of his father breaking things, shouting, and perhaps drinking. The boy can no longer tell which noise is which. The cut on his wrist suggests he is hurting himself, though the poem only hints at this.
He feels fear, sadness, and helplessness, curled up like a snake afraid of being killed. He finds a small comfort in a story his mother once told him, about a thunder that lost its voice and a lightning bolt that fought for it. The boy sees himself as that voiceless thunder. The father, meanwhile, seems lost in his own grey misery.
The mood is tense and claustrophobic, but the ending shifts it. When the lightning calls the thunder to follow, "And it did. / And he did," the lines leave us unsure what he does, though they suggest he finally answers.