What is indicated by "SG" in meteorological reporting?

The term "SG" in meteorological reporting refers specifically to "Snow grains." Snow grains are small, white, opaque grains of ice that fall from the atmosphere, resembling snowflakes but are much smaller and often come during overcast conditions. Their presence in a weather report can indicate certain conditions that may affect flight operations, such as reduced visibility or icy conditions that pilots must be aware of when approaching or departing from an airport.

The other options—Signal ground, Strong gusts, and Sun glare—do not match the meteorological abbreviation "SG." In the context of aviation and meteorology, clarity and specific terminology are crucial, as different abbreviations can lead to misunderstandings about weather conditions. "SG," representing snow grains, highlights specific precipitation types that are important for accurate weather assessments and for ensuring safe aviation operations.