This Aviation Weather Handbook consolidates the weather information from the following advisory circulars (AC) into one source document. By doing this, the Federal Aviation Administration (FAA) intends to streamline access to the FAA's weather documentation for users of the National Airspace System (NAS). The following AC's are now canceled: AC 00-6, Aviation WeatherAC 00-24, ThunderstormsAC 00-30, Clear Air Turbulence AvoidanceAC 00-45, Aviation Weather ServicesAC 00-54, Pilot Windshear GuideAC 00-57, Hazardous Mountain Winds