Aviation Weather Services AC 0045H CHG 2

PURPOSE OF THIS ADVISORY CIRCULAR (AC). This AC explains U.S. aviation weather products and services. It provides details when necessary for interpretation and to aid usage. This publication supplements its companion manual, AC 00-6, Aviation Weather, which documents weather theory and its application to aviation. The objective of this AC is to bring the pilot and operator up-to-date on new and evolving weather information and capabilities to help plan a safe and efficient flight, while also describing the traditional weather products that remain.

PRINCIPAL CHANGES. This change adds guidance and information on new Flight Information Service-Broadcast (FIS-B) weather products/tables and updates the GS/GR coding elements, the Convective significant meteorological information (SIGMET) description, and changes Helicopter Emergency Management Service (HEMS) to helicopter air ambulance (HAA).