What does the code DRSN mean?

The code DRSN stands for "Low drifting snow." This term is used in meteorological observations to describe a condition where snow is not only falling but is also being blown around close to the surface by the wind. The critical aspect of this code is that it specifically indicates that the drifting snow occurs at lower levels, typically influenced by surface winds that can significantly reduce visibility and impact weather conditions.

The other options refer to different snow conditions that do not align with the definition of DRSN. For example, "dry snow" signifies powdery, non-compacted snow lacking moisture, which is distinct from drifting snow. "Deep snow" speaks to the accumulation depth of snow on the ground, but it does not encompass the concept of movement created by wind. "Snow showers" refer to intermittent and often brief periods of snowfall, rather than the sustained drifting of snow as indicated by DRSN. Thus, identifying DRSN specifically as "low drifting snow" accurately captures its weather-related implications and conditions.