visual range
Definition
Noun: - The maximum distance at which an object can be clearly seen and identified by the unaided human eye under prevailing atmospheric conditions. It is a measure of visibility, often used in aviation, maritime, and meteorological contexts. The "given standard object" is typically a known light source or a dark object against the horizon.
Usage
- Visual range is a technical term primarily used to describe visibility conditions. It is a specific, measurable distance.
- It is commonly reported in weather observations, aviation forecasts (METAR/TAF), and shipping reports.
- Example:
Examples
Advanced Usage
- Runway Visual Range (RVR): A specialized term in aviation for the distance over which a pilot on the centerline of a runway can see the runway surface markings or lights.
- Example: The control tower reported an RVR of 1,200 feet for runway 27L.
Variants and Related Words
- Visibility: A more general term for the distance one can see. Visual range is a specific type of or method for measuring visibility.
- Meteorological Optical Range (MOR): A similar, more technically precise term used in meteorology.
Synonyms
- Sight distance
- Visibility range
Notes
- Visual range is not typically used in everyday conversation about how far one can see. In casual contexts, people use the word visibility (e.g., "Poor visibility today").
- It is distinct from visual flight rules (VFR), which are regulations governing flight in visual meteorological conditions.
Noun
-
distance at which a given standard object can be seen with the unaided eye
