On a given day in the winter in St. Louis, Missouri it began snowing in the morning. The snow changed to rain by noon, later in the afternoon sleet was falling which turned to snow, and by evening rain was freezing on bridges and roadways. Explain how such a sequence of precipitation might occur. The four types of precipitation represented here are the result of sub freezing temperatures. The type of precipitation is dependent upon the variation of the atmospheric temperature. In other words, the temperatures above the surface of the earth determine the type of precipitation. Each type has a form - frozen, semi-frozen or liquid. As the air temperature in St. Louis changed during the day, so did the form of precipitation change. In the morning, in order to have snow, the temperatures in...