What does the "VIS" section of a METAR report detail?

The "VIS" section of a METAR report refers specifically to visibility conditions at the airport. In METAR reports, visibility is typically reported in meters or statute miles, indicating how far an observer can see horizontally. This information is crucial for pilots and air traffic controllers as it affects flight operations, specifically takeoff, landing, and overall safety while navigating through various weather conditions.

For instance, if the visibility is low due to fog, rain, or snow, this is a critical factor for determining whether flights can proceed as scheduled. By providing visibility data, the "VIS" section aids in assessing the appropriateness of flight operations under currently observed weather conditions.