What does the code "BLSA" refer to in weather reporting?

The code "BLSA" stands for "Blowing Sand" in weather reporting. This code is used to denote that sand is being lifted and blown by the wind, which can significantly reduce visibility and create hazardous conditions, particularly in desert areas or regions with loose, dry sand. When reporting weather conditions, it's crucial to convey the presence of phenomena like blowing sand as it can impact aviation safety and ground operations.

In contrast, heavy rain, fog in the vicinity, and volcanic ash are identified by different codes. Heavy rain would have its own specific code indicating significant precipitation. Fog generally has a different reporting notation focused on visibility issues. Volcanic ash is also categorized distinctly due to its specific implications for both aviation and local weather conditions. Understanding these codes helps air traffic controllers and pilots assess weather conditions accurately for safe flight operations.