Weather has a major bearing on the outcome of any flight. There have been great strides in the science of meteorology from the early days of flight and is very relevant to the pilots of today. The learning objectives for the JAR ATPL (A) examination require an understanding of the fundamentals of meteorology such as the effects of pressure, density, and temperature in theatmosphere before studying stability, cloud formation, and precipitation. Since wind is a critical element for flight planning and the operation of the aircraft, it is discussed in detail in this volume. The text also covers meteorological hazards to aviation such as thunderstorms, icing, windshear,and turbulence. The interpretation of meteorological messages, synoptic, and upper wind charts is also discussed. Since the Airline Transport Pilot may be required to operate anywhere in the world, this volume also includes an extensive section on global and regional climatology.