Plain English Meaning

A package of weather information a pilot gets before flying, covering what the weather is doing now and what it's expected to do along the route, at the destination, and at any alternates.

Full Definition

A pre-flight summary of current and forecast weather conditions relevant to a planned flight, obtained from an authorized source such as Flight Service, an online aviation weather service, or a Direct User Access Terminal System (DUATS). It typically covers adverse conditions, synopsis, current conditions, en route forecast, destination forecast, , , and any other information that affects the or legality of the flight.