A visiting home health aide and recovering alcoholic, strives to rebuild her broken life, only to have it fall apart once again when she falls in love with her young, paraplegic patient then betrays her trust.

随着美国西北沿岸乾旱情况越来越严重，国家科学中心的戴蒙博士率领顶尖科学小组执行"祈雨者计画"，操控数千架无人飞行器将液态氮投入大气层，试图造云降雨，但他们没想到的是，液态氮的作用超过他们想像，降下来的已经不是雨，而是大量锐如利刃的冰雹！强烈冷风及大雪使得交通瘫痪、数千人冻死街头，更糟的是，这场冰风暴还在持续扩大…