Educational film continues to explain how weather works, particularly cold fronts. Shot of person pushing sled though snow towards sheds. Shots of weather map with cold front described by black line. Shot of diagram describing cold front. Shots of clouds, rain clouds and sound of thunder. Shot of city scene in the rain. Shots of clearer skies. Another diagram of warm air mass trapped between two cold air masses. Shot of weather map with black line and red line. Diagram of warm air mass trapped between cooler air masses appears again with words: "Occluded Front." Shots of clouds. Shot of a town in heavy rain, people walking down the street with umbrellas to the sound of rain.