Plain English Meaning
A short letter code that names the airport or location a weather report came from.
Full Definition
A three- or four-letter code assigned to a specific airport or weather reporting location, used to label that station in aviation weather reports, forecasts, and charts. In the contiguous United States, station identifiers are typically four letters beginning with K (for example, KORD for Chicago O'Hare).
Context Anchor
Seen near the beginning of aviation surface weather reports, such as METAR and SPECI reports, immediately after the report type.