What does “RVR” refer to in aviation weather?

RVR, or Runway Visual Range, is a critical metric in aviation weather that measures the distance a pilot can see down the runway. This measurement is crucial for determining the visibility conditions directly affecting takeoff and landing operations. It is typically reported in meters or feet and provides pilots with important information regarding whether they can safely execute these operations under current weather conditions.

Runway Visual Range takes into account elements like fog, rain, and other visibility-reducing factors, which can directly influence a pilot's ability to see runway markings and lights. Accurate RVR readings are vital, especially during low visibility conditions, as they inform pilots of whether the visibility is within acceptable limits for landing or takeoff.

The other options do not accurately describe the term RVR. Runway Visibility Report refers to a more general reporting of visibility and doesn’t focus specifically on the range as RVR does. Runway Verification Radar and Runway Velocity Range are not standard terms within aviation weather or operations, making them incorrect choices in this context.