How is moderate snow combined with blowing snow encoded in weather reporting?

The correct way to encode moderate snow combined with blowing snow in weather reporting is to use "SN BLSN." The encoding system follows a standard framework where specific weather phenomena are indicated by the use of abbreviations.

In this case, "SN" stands for snow, and "BLSN" represents blowing snow. The combination of the two terms reflects that there is moderate snowfall occurring simultaneously with significant visibility reductions caused by blowing snow. The standard convention in aviation weather reporting emphasizes maintaining clarity and accuracy, so this particular form of encoding follows established protocols.

Using just "SN" or "MOD SN" would indicate snow in general or moderate snow but would not explicitly include the blown aspect. Similarly, "BLSN" alone would imply blowing snow without mentioning the presence of snow itself. Therefore, "SN BLSN" succinctly captures the essential information and provides a complete picture for pilots regarding the weather conditions they may encounter.