Author's blurb: The Forecast Factory is an introduction to the topic of weather forecasting. Students role-play the various elements in forecasting process such as equations, announcers, data analysts, and airplanes. By following the script, the students will summarize the entire process in a single period. This lesson plan is well suited to large classes in lecture-hall settings. A discussion and summary of this teaching method are provided, as well as extensions to other topics, such as global climate modeling.