What does the code "SN" represent in METAR reports?

In METAR reports, the code "SN" specifically represents "Snow." This alphanumeric code is part of the aviation weather reporting system used to communicate various weather phenomena. When "SN" appears in a METAR report, it indicates that snow is occurring at the reporting station, which is crucial information for pilots, air traffic controllers, and meteorologists. Recognizing these codes helps in interpreting the weather conditions accurately and allows for better planning and decision-making in aviation operations.

Other options refer to phenomena that are not represented by the "SN" code, and understanding these distinctions is necessary for accurate METAR decoding. Sleet, strong winds, and storm systems have different codes and meanings, which underscores the importance of knowing the specific codes used in METAR reports.