When global warming triggers the onset of a new Ice Age, tornadoes flatten Los Angeles, a tidal wave engulfs New York City and the entire Northern Hemisphere begins to freeze solid. Now, climatologist Jack Hall, his son Sam, and a small band of survivors must ride out the growing superstorm and stay alive in the face of an enemy more powerful and relentless than anything anyone has ever encountered: Mother Nature.

The Miller family discovers a mysterious gift outside their home on Christmas Eve. The gift contains a snow globe with a perfect reflection of their own town inside. When they shake it snow even begins to fall, whatever happens inside the snow globe happens to their town for real. Then buttons on the snow globe unleash terrible disasters on the town and the family must band together and find a way to destroy it, before it's too late.