Written for pilots who want to improve their flight weather forecasting skills, this manual provides an in-depth discussion of the basic theory and logic of aviation weathercasting and an analysis of 46 instrument flight rules (IFR) cross-country flights made in a light airplane in all seasons. Each flight episode is illustrated with pre-takeoff upper-level and surface weather maps and a small-scale chart, which clearly traces the progress of the flight and the actual in-flight weather conditions.