Plain English Meaning
The individual pieces of weather information — radar pictures, airport weather reports, forecasts, wind data, and so on — that a pilot can receive in the cockpit through a wireless weather service.
Full Definition
The specific set of weather information items — such as radar imagery, METARs, TAFs, AIRMETs, SIGMETs, winds aloft, PIREPs, and lightning data — that are transmitted to an aircraft in flight through a data link like FIS-B (-) or a -based subscription service. Each is a distinct of weather information, refreshed on its own schedule, and displayed in the cockpit on a multifunction , tablet, or portable .