Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A Snow Emergency is the term used to indicate the active response plan when a snow storm severely impacts a city, county or town in the United States or Canada. Schools, universities, government offices, airports and public buildings may close during a Snow Emergency. Snow emergencies are declared as one of three levels; each level defines the recommended or mandated actions of the general public due to severe winter weather.