How would a report indicate that visibility is specifically reduced?

In aviation weather reporting, visibility is a crucial factor for safe operations. When reporting reduced visibility, specific abbreviations are used. The abbreviation "VR" stands for "Visibility Reduced." This designation is important because it immediately alerts pilots and air traffic controllers that visibility conditions are not at optimal levels and could impact flight safety.

The other abbreviations have different meanings within the context of weather observations. For instance, "V" usually signifies visibility in statute miles, while "M" might represent mist conditions affecting visibility. "R" can indicate a range of meteorological phenomena but does not specifically indicate reduced visibility. Therefore, "VR" is the clearest and most appropriate choice to convey that visibility is notably compromised.