The National Weather Service (NWS) plays a significant role in providing weather services to the aviation community. NWS’s weather products and data are vital components of the Federal Aviation Administration’s (FAA) air traffic control system, providing weather information to local, regional, and national air traffic management, navigation, and surveillance systems. NWS aviation weather products include forecasts and warnings of meteorological conditions that could affect air traffic, including thunderstorms, air turbulence, and icing. This book examines options for enhancing the efficiency of aviation weather services provided at en-route centres, with a focus on meteorological services and winter safety.