What is the decoding for BLSN?

The decoding for BLSN is "blowing snow." This term is used in aviation weather reports to indicate that snow is being lifted by winds and is reducing visibility. Blowing snow occurs when there is a significant amount of snow on the ground and winds reach sufficient strength to lift the snow particles into the air, creating a cloud of snow that can greatly impair visibility, often to less than a mile.

It's essential to understand that each of the choices presented reflects a different weather condition, but only "blowing snow" directly describes the situation where snow is specifically being blown about due to wind conditions. This distinction is crucial for pilots and meteorologists, as different weather phenomena can have vastly different implications for flying safety and operational conditions. Recognizing the correct terminology ensures clear communication about weather conditions that could affect aviation.