Which code indicates low drifting snow?

The code "DRSN" specifically indicates low drifting snow in meteorological observations. In aviation weather reports, particular codes are used to provide concise information about various weather phenomena. "DRSN" is a standardized abbreviation that clearly denotes the presence of snow that is being blown by the wind at ground level, which is important for pilots and meteorologists to understand the potential impact on visibility and aircraft performance.

The other codes represent different weather conditions. "FZRASN" refers to freezing rain mixed with snow, which signifies a more complex weather situation including both precipitation types. "TSRA" denotes thunderstorm activity accompanied by rain, indicating a completely different set of weather concerns, especially for flight safety. Lastly, "BFGW" refers to blowing fog with low visibility conditions, which is also distinct from drifting snow. By understanding the specific meanings of these codes, one can better interpret weather conditions relevant to aviation operations.