Plain English Meaning
Weather information made for pilots. It covers what the weather is doing now, what it is expected to do, and what hazards to watch for, all packaged in formats that aviation uses.
Full Definition
Weather data, forecasts, advisories, and reports produced and distributed for the specific purpose of supporting flight planning and in-flight decision-making. It includes observations (such as METARs and PIREPs), forecasts (such as TAFs and area forecasts), and hazard advisories (such as AIRMETs, SIGMETs, and Convective SIGMETs), delivered through approved aviation sources.