Which TAF abbreviation indicates blowing snow?

The abbreviation "BL" in a Terminal Aerodrome Forecast (TAF) stands for "blowing snow." This term is used when snow is being lifted and transported by the wind, reducing visibility and potentially creating hazardous conditions for aviation. Blowing snow can occur under specific wind conditions when there is an existing snow cover, and this phenomenon is particularly important for pilots to be aware of, as it directly impacts aircraft operations.

The other options denote different weather phenomena. "SN" signifies snowfall, which refers to snow falling from the sky but does not imply any wind-related visibility issues. "FG" represents fog, indicating reduced visibility due to the presence of water droplets in the air. "TS" stands for thunderstorms, which include phenomena such as heavy rain, strong winds, and lightning but do not specifically relate to snow or its behavior. Understanding these distinctions is vital for interpreting TAF reports accurately and ensuring flight safety.